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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 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 | $ 64,550 | $ 56,612 |
Interest Income Recognized | 400 | 1,200 |
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 | 2,026 | 2,100 |
Interest Income Recognized | 49 | 143 |
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 | 423 | 370 |
Interest Income Recognized | 40 | 110 |
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 | 1,603 | 1,730 |
Interest Income Recognized | 9 | 33 |
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 | 29,631 | 27,123 |
Interest Income Recognized | 172 | 526 |
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 | 1,972 | 1,946 |
Interest Income Recognized | 10 | 38 |
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 | 15,920 | 14,812 |
Interest Income Recognized | 85 | 287 |
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 | 11,739 | 10,365 |
Interest Income Recognized | 77 | 201 |
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 | 32,893 | 27,389 |
Interest Income Recognized | 179 | 531 |
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 | 32,020 | 26,379 |
Interest Income Recognized | 176 | 511 |
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 | 873 | 1,010 |
Interest Income Recognized | $ 3 | $ 20 |

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