Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) - USD ($) $ in Thousands |
Jun. 30, 2019 |
Dec. 31, 2018 |
Originated Loans [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
$ 5,550,399
|
$ 5,275,296
|
Originated Loans [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
5,447,310
|
5,160,953
|
Originated Loans [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
64,023
|
79,294
|
Originated Loans [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
39,066
|
35,049
|
Originated Loans [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
103,089
|
114,343
|
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
1,201,705
|
1,100,947
|
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
1,154,497
|
1,055,394
|
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
40,460
|
33,723
|
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
6,748
|
11,830
|
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
47,208
|
45,553
|
Originated Loans [Member] | Real estate construction [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
435,385
|
353,008
|
Originated Loans [Member] | Real estate construction [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
435,356
|
337,367
|
Originated Loans [Member] | Real estate construction [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
29
|
15,641
|
Originated Loans [Member] | Real estate construction [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Real estate construction [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Real estate construction [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
29
|
15,641
|
Originated Loans [Member] | Residential real estate [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
1,350,765
|
1,313,645
|
Originated Loans [Member] | Residential real estate [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
1,340,786
|
1,302,912
|
Originated Loans [Member] | Residential real estate [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
684
|
1,026
|
Originated Loans [Member] | Residential real estate [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
9,295
|
9,707
|
Originated Loans [Member] | Residential real estate [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Residential real estate [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
9,979
|
10,733
|
Originated Loans [Member] | Commercial Real Estate [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
1,939,608
|
1,922,349
|
Originated Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
1,893,994
|
1,880,139
|
Originated Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
22,850
|
28,904
|
Originated Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
22,764
|
13,306
|
Originated Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Commercial Real Estate [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
45,614
|
42,210
|
Originated Loans [Member] | Loans to individuals [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
622,936
|
585,347
|
Originated Loans [Member] | Loans to individuals [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
622,677
|
585,141
|
Originated Loans [Member] | Loans to individuals [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Loans to individuals [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
259
|
206
|
Originated Loans [Member] | Loans to individuals [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Originated Loans [Member] | Loans to individuals [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
259
|
206
|
Acquired Loans [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
452,660
|
498,843
|
Acquired Loans [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
437,773
|
485,951
|
Acquired Loans [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
3,978
|
7,700
|
Acquired Loans [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
10,909
|
5,192
|
Acquired Loans [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
14,887
|
12,892
|
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
34,719
|
37,526
|
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
29,199
|
31,399
|
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
762
|
5,890
|
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
4,758
|
237
|
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
5,520
|
6,127
|
Acquired Loans [Member] | Real estate construction [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
6,469
|
5,970
|
Acquired Loans [Member] | Real estate construction [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
5,864
|
5,337
|
Acquired Loans [Member] | Real estate construction [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
605
|
633
|
Acquired Loans [Member] | Real estate construction [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Real estate construction [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Real estate construction [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
605
|
633
|
Acquired Loans [Member] | Residential real estate [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
228,676
|
248,760
|
Acquired Loans [Member] | Residential real estate [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
226,003
|
245,637
|
Acquired Loans [Member] | Residential real estate [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
647
|
736
|
Acquired Loans [Member] | Residential real estate [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
2,026
|
2,387
|
Acquired Loans [Member] | Residential real estate [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Residential real estate [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
2,673
|
3,123
|
Acquired Loans [Member] | Commercial Real Estate [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
178,974
|
201,195
|
Acquired Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
172,898
|
198,201
|
Acquired Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
1,964
|
441
|
Acquired Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
4,112
|
2,553
|
Acquired Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Commercial Real Estate [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
6,076
|
2,994
|
Acquired Loans [Member] | Loans to individuals [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
3,822
|
5,392
|
Acquired Loans [Member] | Loans to individuals [Member] | Pass [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
3,809
|
5,377
|
Acquired Loans [Member] | Loans to individuals [Member] | Special Mention [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Loans to individuals [Member] | Substandard [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
13
|
15
|
Acquired Loans [Member] | Loans to individuals [Member] | Doubtful [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
0
|
0
|
Acquired Loans [Member] | Loans to individuals [Member] | Criticized [Member] |
|
|
Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
Loans and Leases Receivable, Gross |
$ 13
|
$ 15
|