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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
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 | $ 61,623 | $ 63,934
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 | 5,123,351 | 4,253,239
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 | 46,981 | 39,169
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 | 5,604,045 | 4,583,047
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 | 131,603 | 106,316
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 | 464,033 | 70,000
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 | 199,539 | 223,260
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 | 4,804,357 | 3,903,556
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 | 61,623 | 63,934
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 | 131,603 | 106,316
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 | 464,033 | 70,000
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 | 199,539 | 223,260
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 | 5,123,351 | 4,253,239
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 | 46,981 | 39,169
Level 3 | Deposits |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Financial liabilities not on condensed consolidated balance sheets at fair value | 799,688 | 679,491
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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