Loans - Summary of Composition of Impaired Loans, by Class (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	$ 42,095	$ 83,969
Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	25,206
Impaired loans with no related allowance recorded, Unpaid Principal Balance	56,910
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	4,508
Impaired loans with no related allowance recorded, Unpaid Principal Balance	25,077
Impaired Financing Receivables With No Related Allowance [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	18,012
Impaired loans with no related allowance recorded, Unpaid Principal Balance	24,275
Impaired Financing Receivables With No Related Allowance [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	22,520
Impaired loans with no related allowance recorded, Unpaid Principal Balance	49,352
Impaired Financing Receivables With No Related Allowance [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	1,963
Impaired loans with no related allowance recorded, Unpaid Principal Balance	6,408
Impaired Financing Receivables With No Related Allowance [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	31
Impaired loans with no related allowance recorded, Unpaid Principal Balance	31
Impaired Financing Receivables With No Related Allowance [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	1,994
Impaired loans with no related allowance recorded, Unpaid Principal Balance	6,439
Impaired Financing Receivables With No Related Allowance [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	674
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,101
Impaired Financing Receivables With No Related Allowance [Member] | All Other Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	18
Impaired loans with no related allowance recorded, Unpaid Principal Balance	18
Impaired Financing Receivable With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	16,889
Unpaid principal balance		35,262
Impaired loans with no related allowance recorded, Unpaid Principal Balance	16,889
Impaired loans with an allowance recorded, Related allowance	2,477	6,505
Impaired Financing Receivable With Recorded Allowance [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	254
Unpaid principal balance		11,624
Impaired loans with no related allowance recorded, Unpaid Principal Balance	254
Impaired loans with an allowance recorded, Related allowance	68	3,301
Impaired Financing Receivable With Recorded Allowance [Member] | Multifamily residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	246
Unpaid principal balance		247
Impaired loans with no related allowance recorded, Unpaid Principal Balance	246
Impaired loans with an allowance recorded, Related allowance	76	9
Impaired Financing Receivable With Recorded Allowance [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	14,309
Unpaid principal balance		20,784
Impaired loans with no related allowance recorded, Unpaid Principal Balance	14,309
Impaired loans with an allowance recorded, Related allowance	2,055	2,886
Impaired Financing Receivable With Recorded Allowance [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	14,809
Unpaid principal balance		32,655
Impaired loans with no related allowance recorded, Unpaid Principal Balance	14,809
Impaired loans with an allowance recorded, Related allowance	2,199	6,196
Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential revolving open end loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	404
Impaired loans with no related allowance recorded, Unpaid Principal Balance	404
Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	707
Unpaid principal balance		1,689
Impaired loans with no related allowance recorded, Unpaid Principal Balance	707
Impaired loans with an allowance recorded, Related allowance	54	161
Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	173
Unpaid principal balance		183
Impaired loans with no related allowance recorded, Unpaid Principal Balance	173
Impaired loans with an allowance recorded, Related allowance	162	54
Impaired Financing Receivable With Recorded Allowance [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	1,284
Unpaid principal balance		1,872
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,284
Impaired loans with an allowance recorded, Related allowance	216	215
Impaired Financing Receivable With Recorded Allowance [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	776
Unpaid principal balance		691
Impaired loans with no related allowance recorded, Unpaid Principal Balance	776
Impaired loans with an allowance recorded, Related allowance	58	88
Impaired Financing Receivable With Recorded Allowance [Member] | Consumer - others [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	20
Unpaid principal balance		44
Impaired loans with no related allowance recorded, Unpaid Principal Balance	20
Impaired loans with an allowance recorded, Related allowance	4	6
Total Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	42,095
Unpaid principal balance		133,055
Impaired loans with no related allowance recorded, Unpaid Principal Balance	73,799
Impaired loans with an allowance recorded, Related allowance	2,477	6,505
Total Impaired Loans [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	4,762
Unpaid principal balance		65,158
Impaired loans with no related allowance recorded, Unpaid Principal Balance	25,331
Impaired loans with an allowance recorded, Related allowance	68	3,301
Total Impaired Loans [Member] | Multifamily residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	246
Unpaid principal balance		247
Impaired loans with no related allowance recorded, Unpaid Principal Balance	246
Impaired loans with an allowance recorded, Related allowance	76	9
Total Impaired Loans [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	32,321
Unpaid principal balance		56,803
Impaired loans with no related allowance recorded, Unpaid Principal Balance	38,584
Impaired loans with an allowance recorded, Related allowance	2,055	2,886
Total Impaired Loans [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	37,329
Unpaid principal balance		122,208
Impaired loans with no related allowance recorded, Unpaid Principal Balance	64,161
Impaired loans with an allowance recorded, Related allowance	2,199	6,196
Total Impaired Loans [Member] | Single family residential revolving open end loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	404
Impaired loans with no related allowance recorded, Unpaid Principal Balance	404
Total Impaired Loans [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	2,670
Unpaid principal balance		8,617
Impaired loans with no related allowance recorded, Unpaid Principal Balance	7,115
Impaired loans with an allowance recorded, Related allowance	54	161
Total Impaired Loans [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	204
Unpaid principal balance		183
Impaired loans with no related allowance recorded, Unpaid Principal Balance	204
Impaired loans with an allowance recorded, Related allowance	162	54
Total Impaired Loans [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	3,278
Unpaid principal balance		8,800
Impaired loans with no related allowance recorded, Unpaid Principal Balance	7,723
Impaired loans with an allowance recorded, Related allowance	216	215
Total Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	1,450
Unpaid principal balance		2,003
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,877
Impaired loans with an allowance recorded, Related allowance	58	88
Total Impaired Loans [Member] | Consumer - others [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with an allowance recorded, Related allowance	38
Unpaid principal balance		44
Impaired loans with no related allowance recorded, Unpaid Principal Balance	38
Impaired loans with an allowance recorded, Related allowance	4	6
Impaired Financing Receivable With No Related Allowances [Member]
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance		97,793
Impaired Financing Receivable With No Related Allowances [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance		53,534
Impaired Financing Receivable With No Related Allowances [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance		36,019
Impaired Financing Receivable With No Related Allowances [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance		89,553
Impaired Financing Receivable With No Related Allowances [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance		6,928
Impaired Financing Receivable With No Related Allowances [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance		6,928
Impaired Financing Receivable With No Related Allowances [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance		1,312
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	24,430
Impaired loans with no related allowance recorded, Unpaid Principal Balance	47,838
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	3,732
Impaired loans with no related allowance recorded, Unpaid Principal Balance	16,005
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	18,012
Impaired loans with no related allowance recorded, Unpaid Principal Balance	24,275
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	21,744
Impaired loans with no related allowance recorded, Unpaid Principal Balance	40,280
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	1,963
Impaired loans with no related allowance recorded, Unpaid Principal Balance	6,408
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	31
Impaired loans with no related allowance recorded, Unpaid Principal Balance	31
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	1,994
Impaired loans with no related allowance recorded, Unpaid Principal Balance	6,439
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	674
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,101
Loans, Gross [Member] | Impaired Financing Receivables With No Related Allowance [Member] | All Other Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	18
Impaired loans with no related allowance recorded, Unpaid Principal Balance	18
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	16,889	33,271
Impaired loans with an allowance recorded, Related allowance		6,505
Impaired loans with no related allowance recorded, Unpaid Principal Balance	16,889	35,262
Impaired loans with an allowance recorded, Related allowance	2,477
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	254	9,702
Impaired loans with an allowance recorded, Related allowance		3,301
Impaired loans with no related allowance recorded, Unpaid Principal Balance	254	11,624
Impaired loans with an allowance recorded, Related allowance	68
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Multifamily residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	246	247
Impaired loans with an allowance recorded, Related allowance		9
Impaired loans with no related allowance recorded, Unpaid Principal Balance	246	247
Impaired loans with an allowance recorded, Related allowance	76
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	14,309	20,784
Impaired loans with an allowance recorded, Related allowance		2,886
Impaired loans with no related allowance recorded, Unpaid Principal Balance	14,309	20,784
Impaired loans with an allowance recorded, Related allowance	2,055
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	14,809	30,733
Impaired loans with an allowance recorded, Related allowance		6,196
Impaired loans with no related allowance recorded, Unpaid Principal Balance	14,809	32,655
Impaired loans with an allowance recorded, Related allowance	2,199
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential revolving open end loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	404
Impaired loans with no related allowance recorded, Unpaid Principal Balance	404
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	707	1,689
Impaired loans with an allowance recorded, Related allowance		161
Impaired loans with no related allowance recorded, Unpaid Principal Balance	707	1,689
Impaired loans with an allowance recorded, Related allowance	54
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	173	183
Impaired loans with an allowance recorded, Related allowance		54
Impaired loans with no related allowance recorded, Unpaid Principal Balance	173	183
Impaired loans with an allowance recorded, Related allowance	162
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	1,284	1,872
Impaired loans with an allowance recorded, Related allowance		215
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,284	1,872
Impaired loans with an allowance recorded, Related allowance	216
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	776	622
Impaired loans with an allowance recorded, Related allowance		88
Impaired loans with no related allowance recorded, Unpaid Principal Balance	776	691
Impaired loans with an allowance recorded, Related allowance	58
Loans, Gross [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Consumer - others [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	20	44
Impaired loans with an allowance recorded, Related allowance		6
Impaired loans with no related allowance recorded, Unpaid Principal Balance	20	44
Impaired loans with an allowance recorded, Related allowance	4
Loans, Gross [Member] | Total Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	41,319	69,791
Impaired loans with an allowance recorded, Related allowance		6,505
Impaired loans with no related allowance recorded, Unpaid Principal Balance	64,727	102,425
Impaired loans with an allowance recorded, Related allowance	2,477
Loans, Gross [Member] | Total Impaired Loans [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	3,986	26,547
Impaired loans with an allowance recorded, Related allowance		3,301
Impaired loans with no related allowance recorded, Unpaid Principal Balance	16,259	48,359
Impaired loans with an allowance recorded, Related allowance	68
Loans, Gross [Member] | Total Impaired Loans [Member] | Multifamily residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	246	247
Impaired loans with an allowance recorded, Related allowance		9
Impaired loans with no related allowance recorded, Unpaid Principal Balance	246	247
Impaired loans with an allowance recorded, Related allowance	76
Loans, Gross [Member] | Total Impaired Loans [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	32,321	36,831
Impaired loans with an allowance recorded, Related allowance		2,886
Impaired loans with no related allowance recorded, Unpaid Principal Balance	38,584	42,972
Impaired loans with an allowance recorded, Related allowance	2,055
Loans, Gross [Member] | Total Impaired Loans [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	36,553	63,625
Impaired loans with an allowance recorded, Related allowance		6,196
Impaired loans with no related allowance recorded, Unpaid Principal Balance	55,089	91,578
Impaired loans with an allowance recorded, Related allowance	2,199
Loans, Gross [Member] | Total Impaired Loans [Member] | Single family residential revolving open end loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	404
Impaired loans with no related allowance recorded, Unpaid Principal Balance	404
Loans, Gross [Member] | Total Impaired Loans [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	2,670	4,431
Impaired loans with an allowance recorded, Related allowance		161
Impaired loans with no related allowance recorded, Unpaid Principal Balance	7,115	8,617
Impaired loans with an allowance recorded, Related allowance	54
Loans, Gross [Member] | Total Impaired Loans [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	204	183
Impaired loans with an allowance recorded, Related allowance		54
Impaired loans with no related allowance recorded, Unpaid Principal Balance	204	183
Impaired loans with an allowance recorded, Related allowance	162
Loans, Gross [Member] | Total Impaired Loans [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	3,278	4,614
Impaired loans with an allowance recorded, Related allowance		215
Impaired loans with no related allowance recorded, Unpaid Principal Balance	7,723	8,800
Impaired loans with an allowance recorded, Related allowance	216
Loans, Gross [Member] | Total Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	1,450	1,508
Impaired loans with an allowance recorded, Related allowance		88
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,877	2,003
Impaired loans with an allowance recorded, Related allowance	58
Loans, Gross [Member] | Total Impaired Loans [Member] | Consumer - others [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	38	44
Impaired loans with an allowance recorded, Related allowance		6
Impaired loans with no related allowance recorded, Unpaid Principal Balance	38	44
Impaired loans with an allowance recorded, Related allowance	4
Loans, Gross [Member] | Impaired Financing Receivable With No Related Allowances [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		36,520
Impaired loans with no related allowance recorded, Unpaid Principal Balance		67,163
Loans, Gross [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		16,845
Impaired loans with no related allowance recorded, Unpaid Principal Balance		36,735
Loans, Gross [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		16,047
Impaired loans with no related allowance recorded, Unpaid Principal Balance		22,188
Loans, Gross [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		32,892
Impaired loans with no related allowance recorded, Unpaid Principal Balance		58,923
Loans, Gross [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		2,742
Impaired loans with no related allowance recorded, Unpaid Principal Balance		6,928
Loans, Gross [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		2,742
Impaired loans with no related allowance recorded, Unpaid Principal Balance		6,928
Loans, Gross [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		886
Impaired loans with no related allowance recorded, Unpaid Principal Balance		1,312
Other Loans Held for Sale [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	41,319	69,791
Other Loans Held for Sale [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	776
Impaired loans with no related allowance recorded, Unpaid Principal Balance	9,072
Other Loans Held for Sale [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	776
Impaired loans with no related allowance recorded, Unpaid Principal Balance	9,072
Other Loans Held for Sale [Member] | Impaired Financing Receivables With No Related Allowance [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	776
Impaired loans with no related allowance recorded, Unpaid Principal Balance	9,072
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		33,271
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		9,702
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Multifamily residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		247
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		20,784
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		30,733
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		1,689
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		183
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		1,872
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		622
Other Loans Held for Sale [Member] | Impaired Financing Receivable With Recorded Allowance [Member] | Consumer - others [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		44
Other Loans Held for Sale [Member] | Total Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	776	14,178
Impaired loans with no related allowance recorded, Unpaid Principal Balance	9,072	30,630
Recorded investment		83,969
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	776	4,541
Impaired loans with no related allowance recorded, Unpaid Principal Balance	9,072	16,799
Recorded investment		31,088
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Multifamily residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		247
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		9,637
Impaired loans with no related allowance recorded, Unpaid Principal Balance		13,831
Recorded investment		46,468
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment	776	14,178
Impaired loans with no related allowance recorded, Unpaid Principal Balance	9,072	30,630
Recorded investment		77,803
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		4,431
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Single family residential closed end junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		183
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		4,614
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		1,508
Other Loans Held for Sale [Member] | Total Impaired Loans [Member] | Consumer - others [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		44
Other Loans Held for Sale [Member] | Impaired Financing Receivable With No Related Allowances [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		14,178
Impaired loans with no related allowance recorded, Unpaid Principal Balance		30,630
Recorded investment		50,698
Other Loans Held for Sale [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Commercial Real Estate Other Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		4,541
Impaired loans with no related allowance recorded, Unpaid Principal Balance		16,799
Recorded investment		21,386
Other Loans Held for Sale [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Nonfarm nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		9,637
Impaired loans with no related allowance recorded, Unpaid Principal Balance		13,831
Recorded investment		25,684
Other Loans Held for Sale [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans with no related allowance recorded, Recorded investment		14,178
Impaired loans with no related allowance recorded, Unpaid Principal Balance		30,630
Recorded investment		47,070
Other Loans Held for Sale [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Single family residential closed end, first lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		2,742
Other Loans Held for Sale [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Total single family residential loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		2,742
Other Loans Held for Sale [Member] | Impaired Financing Receivable With No Related Allowances [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		$ 886