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Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | $ 6,708,666 |  | $ 6,450,447 |  |  |
Total principal balance of loans owed, net of charge-offs | 6,751,438 |  | 6,496,210 |  |  |
Unamortized net deferred loan fees | (16,674) |  | (15,275) |  |  |
Discounts to principal balance of loans owed, net of charge-offs | (26,098) |  | (30,488) |  |  |
Allowance for credit losses | (115,812) | $ (117,329) | (105,680) | $ (101,488) | $ (97,944) | $ (85,376)
Commercial Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 4,367,445 |  | 4,359,083 |  |  |
Allowance for credit losses | (66,675) | (71,016) | (61,381) | (58,640) | (55,450) | (51,140)
Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 1,288,810 |  | 1,240,743 |  |  |
Allowance for credit losses | (26,618) | (26,513) | (24,639) | (23,932) | (23,931) | (23,474)
Commercial and industrial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 599,757 |  | 569,921 |  |  |
Allowance for credit losses | (12,290) | (11,647) | (13,597) | (10,400) | (9,979) | (3,862)
Construction |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 320,963 |  | 211,560 |  |  |
Allowance for credit losses | (8,097) | (7,031) | (5,142) | (6,132) | (7,522) | (5,667)
Agriculture production |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 123,472 |  | 61,414 |  |  |
Allowance for credit losses | (2,125) | (1,105) | (906) | (2,368) | (1,046) | (1,215)
Leases |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 8,219 |  | 7,726 |  |  |
Allowance for credit losses | (7) | (17) | (15) | (16) | (16) | (18)
CRE non-owner occupied | Commercial Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 2,171,422 |  | 2,149,725 |  |  |
Allowance for credit losses | (33,723) | (33,042) | (30,962) | (29,244) | (28,081) | (25,739)
CRE owner occupied | Commercial Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 958,054 |  | 984,807 |  |  |
Allowance for credit losses | (14,503) | (20,208) | (14,014) | (13,525) | (12,620) | (10,691)
Multifamily | Commercial Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 959,361 |  | 944,537 |  |  |
Allowance for credit losses | (14,239) | (14,075) | (13,132) | (12,749) | (11,795) | (12,395)
Farmland | Commercial Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 278,608 |  | 280,014 |  |  |
Allowance for credit losses | (4,210) | (3,691) | (3,273) | (3,122) | (2,954) | (2,315)
SFR 1-4 1st DT liens | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 870,209 |  | 790,349 |  |  |
SFR HELOCs and junior liens | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 352,798 |  | 393,666 |  |  |
Allowance for credit losses | (10,163) | (10,608) | (11,413) | (11,383) | (11,591) | (10,510)
Other | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Financing receivable | 65,803 |  | 56,728 |  |  |
Allowance for credit losses | $ (2,920) | $ (2,771) | $ (1,958) | $ (1,878) | $ (2,029) | $ (2,241)

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