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Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Estimated fair value | Securities held to maturity |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | $ 66,909 | $ 73,458
Estimated fair value | Portfolio loans, net |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 4,252,679 | 4,096,741
Estimated fair value | State tax credits, held for sale |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 44,770 | 43,871
Estimated fair value | Deposits |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 4,242,061 | 4,153,323
Estimated fair value | Subordinated debentures and notes |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 105,889 | 105,031
Estimated fair value | Federal Home Loan Bank advances |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 361,531 | 172,893
Estimated fair value | Other Borrowings |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 167,086 | 253,530
Level 1 | Securities held to maturity |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 0 | 0
Level 1 | Portfolio loans, net |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 0 | 0
Level 1 | State tax credits, held for sale |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 0 | 0
Level 1 | Deposits |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 3,574,581 | 3,577,641
Level 1 | Subordinated debentures and notes |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 0 | 0
Level 1 | Federal Home Loan Bank advances |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 0 | 0
Level 1 | Other Borrowings |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 0 | 0
Level 2 | Securities held to maturity |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 66,909 | 73,458
Level 2 | Portfolio loans, net |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 0 | 0
Level 2 | State tax credits, held for sale |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 0 | 0
Level 2 | Deposits |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 0 | 0
Level 2 | Subordinated debentures and notes |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 105,889 | 105,031
Level 2 | Federal Home Loan Bank advances |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 361,531 | 172,893
Level 2 | Other Borrowings |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 167,086 | 253,530
Level 3 | Securities held to maturity |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 0 | 0
Level 3 | Portfolio loans, net |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 4,252,679 | 4,096,741
Level 3 | State tax credits, held for sale |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial assets not on condensed consolidated balance sheets at fair value | 44,770 | 43,871
Level 3 | Deposits |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 667,480 | 575,682
Level 3 | Subordinated debentures and notes |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 0 | 0
Level 3 | Federal Home Loan Bank advances |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 0 | 0
Level 3 | Other Borrowings |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | $ 0 | $ 0

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