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Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | $ 6,314,290 |  | $ 4,916,624 |  |  |
Total principal balance of loans owed, net of charge-offs | 6,361,329 |  | 4,946,653 |  |  |
Unamortized net deferred loan fees | (14,783) |  | (13,922) |  |  |
Discounts to principal balance of loans owed, net of charge-offs | (32,256) |  | (16,107) |  |  |
Allowance for credit losses | (101,488) | $ (97,944) | (85,376) | $ (84,306) | $ (86,062) | $ (91,847)
Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 4,238,930 |  | 3,306,054 |  |  |
Allowance for credit losses | (58,640) | (55,450) | (51,140) | (50,729) | (51,637) | (53,693)
Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 1,217,297 |  | 1,071,551 |  |  |
Allowance for credit losses | (23,932) | (23,931) | (23,474) | (23,491) | (23,950) | (25,148)
Commercial and industrial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 534,960 |  | 259,355 |  |  |
Allowance for credit losses | (10,400) | (9,979) | (3,862) | (3,427) | (4,511) | (4,252)
Construction |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 243,571 |  | 222,281 |  |  |
Allowance for credit losses | (6,132) | (7,522) | (5,667) | (5,528) | (4,951) | (7,540)
Agriculture production |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 71,599 |  | 50,811 |  |  |
Allowance for credit losses | (2,368) | (1,046) | (1,215) | (1,119) | (1,007) | (1,209)
Leases |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 7,933 |  | 6,572 |  |  |
Allowance for credit losses | (16) | (16) | (18) | (12) | (6) | (5)
CRE non-owner occupied | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 2,062,406 |  | 1,603,141 |  |  |
Allowance for credit losses | (29,244) | (28,081) | (25,739) | (25,221) | (26,028) | (29,380)
CRE owner occupied | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 969,588 |  | 706,307 |  |  |
Allowance for credit losses | (13,525) | (12,620) | (10,691) | (10,730) | (10,463) | (10,861)
Multifamily | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 927,557 |  | 823,500 |  |  |
Allowance for credit losses | (12,749) | (11,795) | (12,395) | (12,876) | (13,196) | (11,472)
Farmland | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 279,379 |  | 173,106 |  |  |
Allowance for credit losses | (3,122) | (2,954) | (2,315) | (1,902) | (1,950) | (1,980)
SFR 1-4 1st DT liens | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 765,029 |  | 666,960 |  |  |
SFR HELOCs and junior liens | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 394,136 |  | 337,513 |  |  |
Allowance for credit losses | (11,383) | (11,591) | (10,510) | (10,431) | (10,701) | (11,771)
Other | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 58,132 |  | 67,078 |  |  |
Allowance for credit losses | $ (1,878) | $ (2,029) | $ (2,241) | $ (2,442) | $ (2,620) | $ (3,260)

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