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Loans (Tables) | 12 Months Ended
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Dec. 31, 2020
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,
|  | 2020 |  | 2019
|  | (in thousands)
Commercial loans: |  |  |  |
Commercial real estate |  | $ | 4,062,313 |  |  | $ | 3,945,853 |
Commercial business |  | 3,597,968 |  |  | 2,989,613 |
Agriculture |  | 779,627 |  |  | 765,371 |
Construction |  | 268,663 |  |  | 361,533 |
Consumer loans: |  |  |  |
One-to-four family residential real estate |  | 683,570 |  |  | 637,325 |
Other consumer |  | 35,519 |  |  | 43,770 |
Total loans |  | 9,427,660 |  |  | 8,743,465 |
Less: Allowance for credit losses |  | (149,140) |  |  | (83,968) |
Total loans, net |  | $ | 9,278,520 |  |  | $ | 8,659,497 |
Analysis of the Aged Loan Portfolio | The following is an aging of the amortized cost of the loan portfolio as of December 31, 2020 and 2019:
|  | 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 |
|  | 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, 2019 |  | (in thousands)
Commercial loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 3,935,633 |  |  | $ | 6,421 |  |  | $ | — |  |  | — |  |  | $ | 6,421 |  |  | $ | 3,799 |  |  | $ | 3,945,853 |
Commercial business |  | 2,959,826 |  |  | 6,081 |  |  | 2,769 |  |  | — |  |  | 8,850 |  |  | 20,937 |  |  | 2,989,613 |
Agriculture |  | 755,719 |  |  | 2,283 |  |  | 2,346 |  |  | — |  |  | 4,629 |  |  | 5,023 |  |  | 765,371 |
Construction |  | 360,582 |  |  | 951 |  |  | — |  |  | — |  |  | 951 |  |  | — |  |  | 361,533 |
Consumer loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential real estate |  | 631,109 |  |  | 2,516 |  |  | 408 |  |  | — |  |  | 2,924 |  |  | 3,292 |  |  | 637,325 |
Other consumer |  | 43,654 |  |  | 80 |  |  | 27 |  |  | — |  |  | 107 |  |  | 9 |  |  | 43,770 |
Total |  | $ | 8,686,523 |  |  | $ | 18,332 |  |  | $ | 5,550 |  |  | $ | — |  |  | $ | 23,882 |  |  | $ | 33,060 |  |  | $ | 8,743,465 |
Interest written off on nonaccrual loans | The following table summarizes written-off interest on nonaccrual loans for the years ended December 31, 2020, 2019 and 2018:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | (in thousands)
Commercial loans |  | $ | 1,972 |  |  | $ | 1,475 |  |  | $ | 1,296 |
Consumer loans |  | 28 |  |  | 196 |  |  | 268 |
Total |  | $ | 2,000 |  |  | $ | 1,671 |  |  | $ | 1,564 |
Analysis of Nonaccrual Loans | The following summarizes the amortized cost of nonaccrual loans for which there was no related ACL as of December 31, 2020 and 2019:
|  | December 31, 2020 |  | December 31, 2019
|  | (in thousands)
Commercial loans: |  |  |  |
Commercial real estate |  | $ | 6,393 |  |  | $ | 1,715 |
Commercial business |  | 6,382 |  |  | 15,762 |
Agriculture |  | 8,136 |  |  | 1,798 |
Total |  | $ | 20,911 |  |  | $ | 19,275 |
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, 2020, 2019 and 2018:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | 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 |  |  | $ | 891 |  |  | $ | 891 |
Commercial business |  | 11 |  |  | 3,257 |  |  | 3,257 |  |  | 10 |  |  | 6,560 |  |  | 6,560 |  |  | 10 |  |  | 18,352 |  |  | 18,352 |
Agriculture |  | 2 |  |  | 3,495 |  |  | 3,495 |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 27 |  |  | 27 |
Consumer loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential real estate |  | 6 |  |  | 814 |  |  | 814 |  |  | 13 |  |  | 787 |  |  | 787 |  |  | 21 |  |  | 2,777 |  |  | 2,777 |
Other consumer |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Total |  | 19 |  |  | $ | 7,566 |  |  | $ | 7,566 |  |  | 24 |  |  | $ | 7,348 |  |  | $ | 7,348 |  |  | 34 |  |  | $ | 22,047 |  |  | $ | 22,047 |

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