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Loans and Allowance for Credit Losses - Impaired Loans, Net of Government Guarantees and Excluding Loans Acquired, Segregated by Class of Loans (Details) - Loans, Excluding Acquired Loans - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2020
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | $ 90,639
Recorded Investment With No Allowance |  |  | 33,043
Recorded Investment With Allowance |  |  | 35,889
Total Recorded Investment |  |  | 68,932
Related Allowance |  |  | 5,747
Average Investment in Impaired Loans | $ 58,336 | $ 52,147 |
Interest Income Recognized | 425 | 800 |
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 1,919
Recorded Investment With No Allowance |  |  | 1,760
Recorded Investment With Allowance |  |  | 0
Total Recorded Investment |  |  | 1,760
Related Allowance |  |  | 0
Average Investment in Impaired Loans | 1,895 | 2,082 |
Interest Income Recognized | 52 | 95 |
Consumer | Credit cards |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 382
Recorded Investment With No Allowance |  |  | 382
Recorded Investment With Allowance |  |  | 0
Total Recorded Investment |  |  | 382
Related Allowance |  |  | 0
Average Investment in Impaired Loans | 332 | 320 |
Interest Income Recognized | 40 | 70 |
Consumer | Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 1,537
Recorded Investment With No Allowance |  |  | 1,378
Recorded Investment With Allowance |  |  | 0
Total Recorded Investment |  |  | 1,378
Related Allowance |  |  | 0
Average Investment in Impaired Loans | 1,563 | 1,762 |
Interest Income Recognized | 12 | 25 |
Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 34,759
Recorded Investment With No Allowance |  |  | 24,318
Recorded Investment With Allowance |  |  | 6,775
Total Recorded Investment |  |  | 31,093
Related Allowance |  |  | 740
Average Investment in Impaired Loans | 25,517 | 25,095 |
Interest Income Recognized | 178 | 354 |
Real Estate | Construction and development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 4,648
Recorded Investment With No Allowance |  |  | 4,466
Recorded Investment With Allowance |  |  | 72
Total Recorded Investment |  |  | 4,538
Related Allowance |  |  | 4
Average Investment in Impaired Loans | 2,355 | 1,993 |
Interest Income Recognized | 14 | 28 |
Real Estate | Single family residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 19,466
Recorded Investment With No Allowance |  |  | 15,139
Recorded Investment With Allowance |  |  | 2,963
Total Recorded Investment |  |  | 18,102
Related Allowance |  |  | 42
Average Investment in Impaired Loans | 15,486 | 14,351 |
Interest Income Recognized | 105 | 203 |
Real Estate | Other commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 10,645
Recorded Investment With No Allowance |  |  | 4,713
Recorded Investment With Allowance |  |  | 3,740
Total Recorded Investment |  |  | 8,453
Related Allowance |  |  | 694
Average Investment in Impaired Loans | 7,676 | 8,751 |
Interest Income Recognized | 59 | 123 |
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 53,961
Recorded Investment With No Allowance |  |  | 6,965
Recorded Investment With Allowance |  |  | 29,114
Total Recorded Investment |  |  | 36,079
Related Allowance |  |  | 5,007
Average Investment in Impaired Loans | 30,924 | 24,970 |
Interest Income Recognized | 195 | 351 |
Commercial | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 53,436
Recorded Investment With No Allowance |  |  | 6,582
Recorded Investment With Allowance |  |  | 28,998
Total Recorded Investment |  |  | 35,580
Related Allowance |  |  | 5,007
Average Investment in Impaired Loans | 29,776 | 23,811 |
Interest Income Recognized | 187 | 335 |
Commercial | Agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Contractual Principal Balance |  |  | 525
Recorded Investment With No Allowance |  |  | 383
Recorded Investment With Allowance |  |  | 116
Total Recorded Investment |  |  | 499
Related Allowance |  |  | $ 0
Average Investment in Impaired Loans | 1,148 | 1,159 |
Interest Income Recognized | $ 8 | $ 16 |

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