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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance $ 65,201,000 $ 59,935,000 $ 63,613,000 $ 59,585,000
Charge-offs (261,000) (2,000) (360,000) (9,000)
Recoveries 192,000 650,000 379,000 2,007,000
Provision for (Recapture of) loan losses 2,000,000 (1,000,000) 3,500,000 (2,000,000)
Ending Balance 67,132,000 59,583,000 67,132,000 59,583,000
PCI Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance   312,000 204,000 367,000
Charge-offs   0   0
Recoveries   0   0
Provision for (Recapture of) loan losses   (96,000)   (151,000)
Ending Balance   216,000   216,000
Commercial and Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 7,608,000 7,499,000 7,528,000 7,280,000
Charge-offs (48,000) 0 (48,000) 0
Recoveries 49,000 27,000 159,000 37,000
Provision for (Recapture of) loan losses 248,000 (556,000) 218,000 (347,000)
Ending Balance 7,857,000 6,970,000 7,857,000 6,970,000
Small Business Administration [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 1,294,000 884,000 1,078,000 869,000
Charge-offs (210,000) 0 (230,000) 0
Recoveries 4,000 5,000 9,000 10,000
Provision for (Recapture of) loan losses 31,000 (48,000) 262,000 (38,000)
Ending Balance 1,119,000 841,000 1,119,000 841,000
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 46,227,000 41,863,000 45,097,000 41,722,000
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Recapture of) loan losses 2,060,000 734,000 3,190,000 875,000
Ending Balance 48,287,000 42,597,000 48,287,000 42,597,000
Construction [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 864,000 987,000 981,000 984,000
Charge-offs 0 0 0 0
Recoveries 3,000 596,000 6,000 1,930,000
Provision for (Recapture of) loan losses 4,000 (580,000) (116,000) (1,911,000)
Ending Balance 871,000 1,003,000 871,000 1,003,000
SFR Mortgage [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 2,189,000 2,202,000 2,197,000 2,112,000
Charge-offs 0 0 0 0
Recoveries 115,000 0 183,000 0
Provision for (Recapture of) loan losses 19,000 (47,000) (57,000) 43,000
Ending Balance 2,323,000 2,155,000 2,323,000 2,155,000
Dairy & Livestock and Agribusiness [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 5,699,000 4,666,000 5,225,000 4,647,000
Charge-offs 0 0 (78,000) 0
Recoveries 19,000 19,000 19,000 19,000
Provision for (Recapture of) loan losses (377,000) (334,000) 175,000 (315,000)
Ending Balance 5,341,000 4,351,000 5,341,000 4,351,000
Municipal Lease Finance Receivables [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 738,000 834,000 775,000 851,000
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Recapture of) loan losses (12,000) (26,000) (49,000) (43,000)
Ending Balance 726,000 808,000 726,000 808,000
Consumer and Other Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 582,000 688,000 732,000 753,000
Charge-offs (3,000) (2,000) (4,000) (9,000)
Recoveries 2,000 3,000 3,000 11,000
Provision for (Recapture of) loan losses 27,000 (47,000) (123,000) (113,000)
Ending Balance $ 608,000 $ 642,000 $ 608,000 $ 642,000