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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans	$ 11,386,352	$ 12,900,897
90 Days Past Due & Accruing	653	578
Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	42,944	39,072
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	34,812	35,188
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	77,756	74,260
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	11,308,596	12,826,637
Consumer
Financing Receivable, Past Due [Line Items]
Loans	359,346	391,224
90 Days Past Due & Accruing	132	269
Consumer | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,588	3,479
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	394	558
Consumer | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,982	4,037
Consumer | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	357,364	387,187
Consumer | Credit cards
Financing Receivable, Past Due [Line Items]
Loans	177,634	188,845
90 Days Past Due & Accruing	132	256
Consumer | Credit cards | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	644	708
Consumer | Credit cards | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	273	256
Consumer | Credit cards | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	917	964
Consumer | Credit cards | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	176,717	187,881
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans	181,712	202,379
90 Days Past Due & Accruing	0	13
Consumer | Other consumer | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	944	2,771
Consumer | Other consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	121	302
Consumer | Other consumer | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,065	3,073
Consumer | Other consumer | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	180,647	199,306
Real Estate
Financing Receivable, Past Due [Line Items]
Loans	8,368,848	9,223,791
90 Days Past Due & Accruing	127	253
Real Estate | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	23,089	27,761
Real Estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	24,898	27,014
Real Estate | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	47,987	54,775
Real Estate | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,320,861	9,169,016
Real Estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans	1,428,165	1,596,255
90 Days Past Due & Accruing	0	0
Real Estate | Construction and development | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,360	1,375
Real Estate | Construction and development | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,595	3,089
Real Estate | Construction and development | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,955	4,464
Real Estate | Construction and development | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,422,210	1,591,791
Real Estate | Single family residential
Financing Receivable, Past Due [Line Items]
Loans	1,608,028	1,880,673
90 Days Past Due & Accruing	0	253
Real Estate | Single family residential | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,883	23,726
Real Estate | Single family residential | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,061	14,339
Real Estate | Single family residential | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	14,944	38,065
Real Estate | Single family residential | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,593,084	1,842,608
Real Estate | Other commercial
Financing Receivable, Past Due [Line Items]
Loans	5,332,655	5,746,863
90 Days Past Due & Accruing	127	0
Real Estate | Other commercial | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	11,846	2,660
Real Estate | Other commercial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	15,242	9,586
Real Estate | Other commercial | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	27,088	12,246
Real Estate | Other commercial | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,305,567	5,734,617
Commercial
Financing Receivable, Past Due [Line Items]
Loans	2,268,191	2,750,291
90 Days Past Due & Accruing	394	56
Commercial | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	18,267	7,740
Commercial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	9,520	7,616
Commercial | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	27,787	15,356
Commercial | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,240,404	2,734,935
Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans	2,074,729	2,574,386
90 Days Past Due & Accruing	394	56
Commercial | Commercial | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	18,162	7,514
Commercial | Commercial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	9,167	7,429
Commercial | Commercial | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	27,329	14,943
Commercial | Commercial | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,047,400	2,559,443
Commercial | Agricultural
Financing Receivable, Past Due [Line Items]
Loans	193,462	175,905
90 Days Past Due & Accruing	0	0
Commercial | Agricultural | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	105	226
Commercial | Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	353	187
Commercial | Agricultural | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	458	413
Commercial | Agricultural | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	193,004	175,492
Other
Financing Receivable, Past Due [Line Items]
Loans	389,967	535,591
90 Days Past Due & Accruing	0	0
Other | Gross 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	92
Other | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Other | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	92
Other | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	$ 389,967	$ 535,499

X

- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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