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Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Contract SecurityLoan | Dec. 31, 2018 USD ($) Contract | Dec. 31, 2017 USD ($) Contract | Sep. 30, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total fixed rate loans held | $ 3,860,000,000 |  |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank | 6,030,000,000.00 | $ 5,710,000,000 |  |
Loans held-for-sale | 0 | 0 |  |
Impaired, at carrying value | 8,389,000 | 23,545,000 | $ 15,525,000 |
Impaired, at carrying value | $ 508,000 | 561,000 | 75,000 |
Number of performing loans | SecurityLoan | 12 |  |  |
Provision for unfunded loan commitments | $ 0 | 250,000 | 400,000 |
Reserve for credit risk for undisbursed commitments | 9,000,000.0 | 9,000,000.0 |  |
Allocation of allowance to troubled debt restructuring | $ 0 | $ 490,000 |  |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract | 0 | 0 |  |
Percentage of PCI loans to Loan Receivable | 0.20% | 0.20% |  |
Community Bank [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for unfunded loan commitments |  | $ 2,900,000 |  |
Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable gross | $ 5,374,617,000 | 5,408,636,000 |  |
Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 71.01% |  |  |
Nonaccrual Commercial and Industrial Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | $ 1,300,000 |  |  |
Nonaccrual Small Business Administration Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 2,000,000.0 |  |  |
Impaired Loans Modified in Troubled Debt Restructure [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Impaired, at carrying value | 3,400,000 |  |  |
Loans classified as troubled debt restructured | 3,400,000 |  |  |
Single-family Residential Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 878,000 |  |  |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial real estate loan outstanding balance modified as a TDR within the previous 12 months that subsequently defaulted |  |  | $ 3,100,000 |
Nonaccrual Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | $ 724,000 |  |  |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 76.31% |  |  |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract |  |  | 1 |
Consumer and Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | $ 377,000 |  |  |
Nonperforming Financing Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Impaired, at carrying value | 244,000 |  |  |
Loans classified as troubled debt restructured | 244,000 |  |  |
Performing Financing Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Impaired, at carrying value | 8,400,000 |  |  |
Loans classified as troubled debt restructured | 3,100,000 |  |  |
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | 536,000 |  |  |
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | 2,100,000 |  |  |
Performing Financing Receivable [Member] | Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | 78,000 |  |  |
Performing Financing Receivable [Member] | Small Business Administration [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans classified as troubled debt restructured | 397,000 |  |  |
Loans, Excluding PCI Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable gross | 383,700,000 |  |  |
Impaired, at carrying value |  | 23,500,000 |  |
Outstanding balance |  | 19,951,000 |  | $ 5,277,000
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable gross |  | 5,394,229,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable gross | 323,500,000 | 340,500,000 |  |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable gross | $ 60,200,000 | 54,000,000.0 |  |
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance |  | 7,490,000 |  | 1,266,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance |  | $ 2,892,000 |  | $ 2,032,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 4.50% | 4.27% |  |
Notes receivable gross | $ 241,800,000 | $ 231,000,000.0 |  |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Dairy & Livestock Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable gross | 125,900,000 | 126,900,000 |  |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Agricultural Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable gross | $ 115,900,000 | $ 104,100,000 |  |

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