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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 82,817 $ 86,540 $ 86,842 $ 85,117
Charge-offs (51) (88) (4,318) (198)
Recoveries 20 15 262 48
Provision for (Recapture of) Credit Losses 0 500 0 2,000
Ending balance 82,786 86,967 82,786 86,967
Commercial Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 69,445 67,117 69,466 64,806
Charge-offs 0 0 (2,258) 0
Recoveries 0 0 0 0
Provision for (Recapture of) Credit Losses (40) 826 2,197 3,137
Ending balance 69,405 67,943 69,405 67,943
Construction [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 1,296 1,674 1,277 1,702
Charge-offs 0 0 0 0
Recoveries 2 3 5 6
Provision for (Recapture of) Credit Losses (510) (515) (494) (546)
Ending balance 788 1,162 788 1,162
SBA [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 2,531 2,729 2,679 2,809
Charge-offs (49) (87) (139) (181)
Recoveries 18 9 81 21
Provision for (Recapture of) Credit Losses (4) 5 (125) 7
Ending balance 2,496 2,656 2,496 2,656
Commercial and Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 5,059 8,963 9,116 10,206
Charge-offs 0 0 (1,917) (16)
Recoveries 0 0 176 14
Provision for (Recapture of) Credit Losses 44 158 (2,272) (1,083)
Ending balance 5,103 9,121 5,103 9,121
Dairy & Livestock and Agribusiness [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 3,252 4,770 3,098 4,400
Charge-offs 0 0 0 0
Recoveries 0 3 0 7
Provision for (Recapture of) Credit Losses 523 187 677 553
Ending balance 3,775 4,960 3,775 4,960
Municipal Lease Finance Receivables [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 194 283 210 296
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Recapture of) Credit Losses (8) (10) (24) (23)
Ending balance 186 273 186 273
SFR Mortgage [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 483 409 535 366
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Recapture of) Credit Losses 15 41 (37) 84
Ending balance 498 450 498 450
Consumer and Other Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 557 595 461 532
Charge-offs (2) (1) (4) (1)
Recoveries 0 0 0 0
Provision for (Recapture of) Credit Losses (20) (192) 78 (129)
Ending balance $ 535 $ 402 $ 535 $ 402