Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		$ 1,894,772
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		5,573,551
Financing Receivable, Originated Two Years before Latest Fiscal Year		3,580,090
Financing Receivable, Originated Three Years before Latest Fiscal Year		2,191,663
Financing Receivable, Originated Four Years before Latest Fiscal Year		1,647,697
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		1,699,354
Financing Receivable, Revolving		3,809,727
Loans		20,396,853			$ 19,787,876
Potential problem loans not included in nonperforming assets		249,200			276,000
Available-for-sale securities transferred to held-to-maturity portfolio		873,613	$ 0	$ 179,800
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		1,874,215
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		5,480,691
Financing Receivable, Originated Two Years before Latest Fiscal Year		3,522,723
Financing Receivable, Originated Three Years before Latest Fiscal Year		2,121,007
Financing Receivable, Originated Four Years before Latest Fiscal Year		1,605,850
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		1,661,012
Financing Receivable, Revolving		3,682,274
Loans		19,947,772			19,299,393
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		8,701
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		19,450
Financing Receivable, Originated Two Years before Latest Fiscal Year		24,423
Financing Receivable, Originated Three Years before Latest Fiscal Year		34,974
Financing Receivable, Originated Four Years before Latest Fiscal Year		8,686
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		4,334
Financing Receivable, Revolving		27,629
Loans		128,197			148,267
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	[1]	8,862
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	57,305
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	28,692
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	30,596
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	27,314
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	10,129
Financing Receivable, Revolving	[1]	87,017
Loans	[1]	249,915			278,611
Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		2,994
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		15,811
Financing Receivable, Originated Two Years before Latest Fiscal Year		4,252
Financing Receivable, Originated Three Years before Latest Fiscal Year		5,086
Financing Receivable, Originated Four Years before Latest Fiscal Year		5,847
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		23,879
Financing Receivable, Revolving		12,807
Loans		70,676			61,605
Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		294
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans		294			0
Commercial real estate- owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		180,510
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		518,676
Financing Receivable, Originated Two Years before Latest Fiscal Year		543,210
Financing Receivable, Originated Three Years before Latest Fiscal Year		442,708
Financing Receivable, Originated Four Years before Latest Fiscal Year		448,749
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		425,541
Financing Receivable, Revolving		90,776
Loans		2,650,170			2,669,766
Commercial real estate- owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		178,512
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		505,153
Financing Receivable, Originated Two Years before Latest Fiscal Year		529,837
Financing Receivable, Originated Three Years before Latest Fiscal Year		414,639
Financing Receivable, Originated Four Years before Latest Fiscal Year		425,788
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		416,602
Financing Receivable, Revolving		43,273
Loans		2,513,804
Commercial real estate- owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,706
Financing Receivable, Originated Two Years before Latest Fiscal Year		3,383
Financing Receivable, Originated Three Years before Latest Fiscal Year		12,769
Financing Receivable, Originated Four Years before Latest Fiscal Year		678
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		353
Financing Receivable, Revolving		919
Loans		19,808
Commercial real estate- owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	[1]	1,263
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	11,357
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	8,296
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	12,981
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	20,660
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	4,183
Financing Receivable, Revolving	[1]	46,494
Loans	[1]	105,234
Commercial real estate- owner occupied | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		735
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		460
Financing Receivable, Originated Two Years before Latest Fiscal Year		1,694
Financing Receivable, Originated Three Years before Latest Fiscal Year		2,319
Financing Receivable, Originated Four Years before Latest Fiscal Year		1,623
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		4,403
Financing Receivable, Revolving		90
Loans		11,324
Commercial real estate- owner occupied | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans		0
Commercial real estate- Non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		427,984
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,330,437
Financing Receivable, Originated Two Years before Latest Fiscal Year		926,666
Financing Receivable, Originated Three Years before Latest Fiscal Year		842,023
Financing Receivable, Originated Four Years before Latest Fiscal Year		791,870
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		673,079
Financing Receivable, Revolving		78,513
Loans		5,070,572			5,039,452
Commercial real estate- Non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		421,156
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,321,669
Financing Receivable, Originated Two Years before Latest Fiscal Year		922,005
Financing Receivable, Originated Three Years before Latest Fiscal Year		817,345
Financing Receivable, Originated Four Years before Latest Fiscal Year		787,630
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		663,636
Financing Receivable, Revolving		78,264
Loans		5,011,705
Commercial real estate- Non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		6,828
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,305
Financing Receivable, Originated Two Years before Latest Fiscal Year		1,162
Financing Receivable, Originated Three Years before Latest Fiscal Year		17,027
Financing Receivable, Originated Four Years before Latest Fiscal Year		1,222
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		1,472
Financing Receivable, Revolving		249
Loans		29,265
Commercial real estate- Non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	5,056
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	2,714
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	7,502
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	1,952
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	3,002
Financing Receivable, Revolving		0
Loans	[1]	20,226
Commercial real estate- Non-owner occupied | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		2,407
Financing Receivable, Originated Two Years before Latest Fiscal Year		785
Financing Receivable, Originated Three Years before Latest Fiscal Year		149
Financing Receivable, Originated Four Years before Latest Fiscal Year		1,066
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		4,969
Financing Receivable, Revolving		0
Loans		9,376
Commercial real estate- Non-owner occupied | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans		0
Consumer real estate – mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		137,588
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		647,245
Financing Receivable, Originated Two Years before Latest Fiscal Year		458,015
Financing Receivable, Originated Three Years before Latest Fiscal Year		218,662
Financing Receivable, Originated Four Years before Latest Fiscal Year		175,847
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		446,683
Financing Receivable, Revolving		1,022,426
Loans		3,106,465			3,068,625
Consumer real estate – mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		134,885
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		643,354
Financing Receivable, Originated Two Years before Latest Fiscal Year		455,461
Financing Receivable, Originated Three Years before Latest Fiscal Year		216,073
Financing Receivable, Originated Four Years before Latest Fiscal Year		172,577
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		431,480
Financing Receivable, Revolving		1,008,141
Loans		3,061,970
Consumer real estate – mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		204
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,173
Financing Receivable, Originated Two Years before Latest Fiscal Year		1,370
Financing Receivable, Originated Three Years before Latest Fiscal Year		70
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		108
Financing Receivable, Revolving		8,739
Loans		11,664
Consumer real estate – mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	[1]	1,382
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	1,210
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	924
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	385
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	2,167
Financing Receivable, Revolving	[1]	657
Loans	[1]	6,725
Consumer real estate – mortgage | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		1,117
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,508
Financing Receivable, Originated Two Years before Latest Fiscal Year		1,184
Financing Receivable, Originated Three Years before Latest Fiscal Year		1,595
Financing Receivable, Originated Four Years before Latest Fiscal Year		2,885
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		12,928
Financing Receivable, Revolving		4,889
Loans		26,106
Consumer real estate – mortgage | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans		0
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		289,372
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,339,631
Financing Receivable, Originated Two Years before Latest Fiscal Year		672,913
Financing Receivable, Originated Three Years before Latest Fiscal Year		160,623
Financing Receivable, Originated Four Years before Latest Fiscal Year		25,931
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		14,333
Financing Receivable, Revolving		18,134
Loans		2,520,937			2,430,483
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		286,814
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,337,729
Financing Receivable, Originated Two Years before Latest Fiscal Year		662,700
Financing Receivable, Originated Three Years before Latest Fiscal Year		156,448
Financing Receivable, Originated Four Years before Latest Fiscal Year		25,691
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		12,131
Financing Receivable, Revolving		18,134
Loans		2,499,647			2,422,347
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		968
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		243
Financing Receivable, Originated Two Years before Latest Fiscal Year		10,098
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		738
Financing Receivable, Revolving		0
Loans		12,047			2,816
Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	[1]	1,502
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	829
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	31
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	4,083
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	240
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	168
Financing Receivable, Revolving		0
Loans	[1]	6,853			3,042
Construction and land development | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		88
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		830
Financing Receivable, Originated Two Years before Latest Fiscal Year		84
Financing Receivable, Originated Three Years before Latest Fiscal Year		92
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		1,296
Financing Receivable, Revolving		0
Loans		2,390			2,278
Construction and land development | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans		0			0
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		823,589
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,701,217
Financing Receivable, Originated Two Years before Latest Fiscal Year		967,332
Financing Receivable, Originated Three Years before Latest Fiscal Year		514,593
Financing Receivable, Originated Four Years before Latest Fiscal Year		197,931
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		135,151
Financing Receivable, Revolving		2,412,504
Loans		6,752,317			6,290,296
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		817,119
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,636,441
Financing Receivable, Originated Two Years before Latest Fiscal Year		940,772
Financing Receivable, Originated Three Years before Latest Fiscal Year		503,490
Financing Receivable, Originated Four Years before Latest Fiscal Year		186,801
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		133,277
Financing Receivable, Revolving		2,347,145
Loans		6,565,045			6,069,757
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		701
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		15,023
Financing Receivable, Originated Two Years before Latest Fiscal Year		8,410
Financing Receivable, Originated Three Years before Latest Fiscal Year		5,108
Financing Receivable, Originated Four Years before Latest Fiscal Year		6,786
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		986
Financing Receivable, Revolving		17,713
Loans		54,727			79,819
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	[1]	4,715
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	38,853
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	17,651
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	5,106
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	4,077
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	609
Financing Receivable, Revolving	[1]	39,819
Loans	[1]	110,830			125,035
Commercial and industrial | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		1,054
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		10,606
Financing Receivable, Originated Two Years before Latest Fiscal Year		499
Financing Receivable, Originated Three Years before Latest Fiscal Year		889
Financing Receivable, Originated Four Years before Latest Fiscal Year		267
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		279
Financing Receivable, Revolving		7,828
Loans		21,422			15,685
Commercial and industrial | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		294
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans		294			0
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		35,729
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		36,345
Financing Receivable, Originated Two Years before Latest Fiscal Year		11,954
Financing Receivable, Originated Three Years before Latest Fiscal Year		13,054
Financing Receivable, Originated Four Years before Latest Fiscal Year		7,369
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		4,567
Financing Receivable, Revolving		187,374
Loans		296,392			289,254
Consumer and other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		35,729
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		36,345
Financing Receivable, Originated Two Years before Latest Fiscal Year		11,948
Financing Receivable, Originated Three Years before Latest Fiscal Year		13,012
Financing Receivable, Originated Four Years before Latest Fiscal Year		7,363
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		3,886
Financing Receivable, Revolving		187,318
Loans		295,601			288,361
Consumer and other | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		677
Financing Receivable, Revolving		9
Loans		686			698
Consumer and other | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving	[1]	47
Loans	[1]	47			47
Consumer and other | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		6
Financing Receivable, Originated Three Years before Latest Fiscal Year		42
Financing Receivable, Originated Four Years before Latest Fiscal Year		6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		4
Financing Receivable, Revolving		0
Loans		58			148
Consumer and other | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans		0			0
Commercial real estate – mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					7,709,218
Commercial real estate – mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					7,499,725
Commercial real estate – mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					51,147
Commercial real estate – mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]				139,518
Commercial real estate – mortgage | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					18,828
Commercial real estate – mortgage | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					0
Consumer real estate – mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		$ 3,106,465			3,068,625
Consumer real estate – mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					3,019,203
Consumer real estate – mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					13,787
Consumer real estate – mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]				10,969
Consumer real estate – mortgage | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					24,666
Consumer real estate – mortgage | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans					$ 0

[1] Potential problem loans represent those loans with a well-defined weakness and where information about possible credit problems of borrowers has caused management to have doubts about the borrower's ability to comply with present repayment terms. This definition is believed to be substantially consistent with the standards established by Pinnacle Bank's primary regulators for loans classified as substandard, excluding troubled debt restructurings. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $249.2 million at March 31, 2020, compared to $276.0 million at December 31, 2019.