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Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | $ 4,826,338 |  | $ 4,307,366 |  |  |
Total principal balance of loans owed, net of charge-offs | 4,875,675 |  | 4,351,725 |  |  |
Unamortized net deferred loan fees | (20,767) |  | (8,927) |  |  |
Discounts to principal balance of loans owed, net of charge-offs | (28,570) |  | (35,432) |  |  |
Allowance for loan losses | (87,575) | $ (79,739) | (30,616) | $ (31,537) | $ (32,868) | $ (32,582)
Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 2,936,422 |  | 2,818,782 |  |  |
Allowance for loan losses | (50,294) | (44,850) | (11,995) | (11,941) | (12,099) | (12,944)
Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 926,835 |  | 955,050 |  |  |
Allowance for loan losses | (24,007) | (23,165) | (10,084) | (10,956) | (11,128) | (11,051)
Commercial and industrial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 633,897 |  | 249,791 |  |  |
Allowance for loan losses | (4,534) | (4,018) | (4,867) | (5,471) | (6,481) | (5,610)
Construction |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 284,933 |  | 249,827 |  |  |
Allowance for loan losses | (7,640) | (6,775) | (3,388) | (2,953) | (2,896) | (2,497)
Agriculture production |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 40,613 |  | 32,633 |  |  |
Allowance for loan losses | (1,093) | (919) | (261) | (216) | (264) | (480)
Leases |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 3,638 |  | 1,283 |  |  |
Allowance for loan losses | (7) | (12) | (21) | 0 | 0 | 0
CRE non-owner occupied | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 1,600,284 |  | 1,609,556 |  |  |
Allowance for loan losses | (28,847) | (26,091) | (5,948) | (6,451) | (6,182) | (7,401)
CRE owner occupied | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 581,090 |  | 546,434 |  |  |
Allowance for loan losses | (9,625) | (8,710) | (2,027) | (1,679) | (2,214) | (2,711)
Multifamily | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 602,199 |  | 517,725 |  |  |
Allowance for loan losses | (10,032) | (8,581) | (3,352) | (3,151) | (3,082) | (2,429)
Farmland | Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 152,849 |  | 145,067 |  |  |
Allowance for loan losses | (1,790) | (1,468) | (668) | (660) | (621) | (403)
SFR 1-4 1st DT liens | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 511,759 |  | 509,508 |  |  |
SFR HELOCs and junior liens | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 332,820 |  | 362,886 |  |  |
Allowance for loan losses | (11,676) | (12,108) | (6,183) | (6,995) | (7,101) | (7,582)
Other | Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total | 82,256 |  | 82,656 |  |  |
Allowance for loan losses | $ (3,394) | $ (3,042) | $ (1,595) | $ (1,555) | $ (1,451) | $ (793)

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