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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type (Detail) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment $ 35,684,000   $ 68,861,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 4,194,022,000   3,667,515,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 74,929,000   94,431,000
Allowance for Loan Losses, Individually Evaluated for Impairment 548,000   662,000
Allowance for Loan Losses, Collectively Evaluated for Impairment 59,853,000   58,487,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 600,000   0
Commercial and Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 1,349,000   1,687,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 493,134,000   412,022,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 493,000   607,000
Allowance for Loan Losses, Collectively Evaluated for Impairment 8,973,000   5,926,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Small Business Administration [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 3,867,000   3,319,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 100,176,000   112,807,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 33,000   4,000
Allowance for Loan Losses, Collectively Evaluated for Impairment 971,000   1,961,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Commercial Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 15,806,000   43,647,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 2,895,959,000   2,525,481,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 38,808,000   34,611,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 7,651,000   7,651,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 83,059,000   49,927,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 4,000   23,000
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,104,000   850,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
SFR Mortgage [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 5,502,000   6,389,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 235,988,000   215,307,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 6,000   22,000
Allowance for Loan Losses, Collectively Evaluated for Impairment 2,565,000   2,617,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Dairy & Livestock and Agribusiness [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 659,000   5,262,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 238,583,000   207,408,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 5,971,000   4,868,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Municipal Lease Finance Receivables [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 0   0
Recorded Investment in Loans, Collectively Evaluated for Impairment 68,309,000   75,839,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,033,000   1,031,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Consumer and Other Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 850,000   906,000
Recorded Investment in Loans, Collectively Evaluated for Impairment 78,814,000   68,724,000
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 12,000   6,000
Allowance for Loan Losses, Collectively Evaluated for Impairment 428,000   823,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Unallocated [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 0   0
Recorded Investment in Loans, Collectively Evaluated for Impairment 0   0
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 0   5,800,000
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
PCI Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 0   0
Recorded Investment in Loans, Collectively Evaluated for Impairment 0   0
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 74,929,000 $ 93,712,000 94,431,000
Allowance for Loan Losses, Individually Evaluated for Impairment 0   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 0   0
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality $ 600,000 $ 0 $ 0