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Loans (Tables) | 12 Months Ended
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Dec. 31, 2021
Loans and Leases Receivable, Net Amount [Abstract] |
Analysis of Loan Portfolio by Major Types of Loans | The Company’s loan portfolio includes originated and purchased loans. The following is an analysis of the loan portfolio by segment (net of unearned income):
|  | December 31,
|  | 2021 |  | 2020
|  | (in thousands)
Commercial loans: |  |  |  |
Commercial real estate |  | $ | 4,981,263 |  |  | $ | 4,062,313 |
Commercial business |  | 3,423,268 |  |  | 3,597,968 |
Agriculture |  | 795,715 |  |  | 779,627 |
Construction |  | 384,755 |  |  | 268,663 |
Consumer loans: |  |  |  |
One-to-four family residential real estate |  | 1,013,908 |  |  | 683,570 |
Other consumer |  | 43,028 |  |  | 35,519 |
Total loans |  | 10,641,937 |  |  | 9,427,660 |
Less: Allowance for credit losses |  | (155,578) |  |  | (149,140) |
Total loans, net |  | $ | 10,486,359 |  |  | $ | 9,278,520 |
Analysis of the Aged Loan Portfolio | The following is an aging of the amortized cost of the loan portfolio as of December 31, 2021 and 2020:
|  | Current Loans |  | 30 - 59 Days Past Due |  | 60 - 89 Days Past Due |  | Greater than 90 Days Past Due |  | Total Past Due |  | Nonaccrual Loans |  | Total Loans
December 31, 2021 |  | (in thousands)
Commercial loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 4,977,781 |  |  | $ | — |  |  | $ | 1,610 |  |  | $ | — |  |  | $ | 1,610 |  |  | $ | 1,872 |  |  | $ | 4,981,263 |
Commercial business |  | 3,406,539 |  |  | 2,721 |  |  | 687 |  |  | — |  |  | 3,408 |  |  | 13,321 |  |  | 3,423,268 |
Agriculture |  | 789,112 |  |  | 1,207 |  |  | — |  |  | — |  |  | 1,207 |  |  | 5,396 |  |  | 795,715 |
Construction |  | 384,755 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 384,755 |
Consumer loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential real estate |  | 1,010,343 |  |  | 921 |  |  | 211 |  |  | — |  |  | 1,132 |  |  | 2,433 |  |  | 1,013,908 |
Other consumer |  | 42,998 |  |  | 11 |  |  | — |  |  | — |  |  | 11 |  |  | 19 |  |  | 43,028 |
Total |  | $ | 10,611,528 |  |  | $ | 4,860 |  |  | $ | 2,508 |  |  | $ | — |  |  | $ | 7,368 |  |  | $ | 23,041 |  |  | $ | 10,641,937 |
|  | Current Loans |  | 30 - 59 Days Past Due |  | 60 - 89 Days Past Due |  | Greater than 90 Days Past Due |  | Total Past Due |  | Nonaccrual Loans |  | Total Loans
December 31, 2020 |  | (in thousands)
Commercial loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 4,037,309 |  |  | $ | 17,292 |  |  | $ | — |  |  | — |  |  | $ | 17,292 |  |  | $ | 7,712 |  |  | $ | 4,062,313 |
Commercial business |  | 3,578,905 |  |  | 1,282 |  |  | 4,559 |  |  | — |  |  | 5,841 |  |  | 13,222 |  |  | 3,597,968 |
Agriculture |  | 767,102 |  |  | 911 |  |  | — |  |  | — |  |  | 911 |  |  | 11,614 |  |  | 779,627 |
Construction |  | 268,304 |  |  | — |  |  | 142 |  |  | — |  |  | 142 |  |  | 217 |  |  | 268,663 |
Consumer loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential real estate |  | 677,627 |  |  | 2,283 |  |  | 1,659 |  |  | — |  |  | 3,942 |  |  | 2,001 |  |  | 683,570 |
Other consumer |  | 35,450 |  |  | 24 |  |  | 5 |  |  | — |  |  | 29 |  |  | 40 |  |  | 35,519 |
Total |  | $ | 9,364,697 |  |  | $ | 21,792 |  |  | $ | 6,365 |  |  | $ | — |  |  | $ | 28,157 |  |  | $ | 34,806 |  |  | $ | 9,427,660 |
Interest written off on nonaccrual loans | The following table summarizes written-off interest on nonaccrual loans for the years ended December 31, 2021, 2020 and 2019:
|  | Years Ended December 31,
|  | 2021 |  | 2020 |  | 2019
|  | (in thousands)
Commercial loans |  | $ | 628 |  |  | $ | 1,972 |  |  | $ | 1,475 |
Consumer loans |  | 45 |  |  | 28 |  |  | 196 |
Total |  | $ | 673 |  |  | $ | 2,000 |  |  | $ | 1,671 |
Analysis of Nonaccrual Loans | The following summarizes the amortized cost of nonaccrual loans for which there was no related ACL as of December 31, 2021 and 2020:
|  | December 31, 2021 |  | December 31, 2020
|  | (in thousands)
Commercial loans: |  |  |  |
Commercial real estate |  | $ | 932 |  |  | $ | 6,393 |
Commercial business |  | 5,131 |  |  | 6,382 |
Agriculture |  | 3,756 |  |  | 8,136 |
Total |  | $ | 9,819 |  |  | $ | 20,911 |
Analysis of loans classified as Troubled Debt Restructurings (“TDR”) | The following is an analysis of loans classified as TDR for the years ended December 31, 2021, 2020 and 2019:
|  | Years Ended December 31,
|  | 2021 |  | 2020 |  | 2019
|  | Number of TDR Modifications |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment |  | Number of TDR Modifications |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment |  | Number of TDR Modifications |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment
|  | (dollars in thousands)
Commercial loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | 1 |  |  | $ | 628 |  |  | $ | 628 |  |  | — |  |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | — |  |  | $ | — |
Commercial business |  | 11 |  |  | 2,600 |  |  | 2,600 |  |  | 11 |  |  | 3,257 |  |  | 3,257 |  |  | 10 |  |  | 6,560 |  |  | 6,560 |
Agriculture |  | 1 |  |  | 583 |  |  | 583 |  |  | 2 |  |  | 3,495 |  |  | 3,495 |  |  | — |  |  | — |  |  | — |
Consumer loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential real estate |  | 3 |  |  | 155 |  |  | 155 |  |  | 6 |  |  | 814 |  |  | 814 |  |  | 13 |  |  | 787 |  |  | 787 |
Other consumer |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | 1 |
Total |  | 16 |  |  | $ | 3,966 |  |  | $ | 3,966 |  |  | 19 |  |  | $ | 7,566 |  |  | $ | 7,566 |  |  | 24 |  |  | $ | 7,348 |  |  | $ | 7,348 |

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