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Fair Value Measurements - Segregated by Level of Valuation Inputs (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financial assets: |  |
Cash and cash equivalents | $ 420,207 | $ 239,973
Securities held to maturity | 15,934 | 603,360
Portfolio loans, net | 6,480,751 | 5,517,780
Financial liabilities: |  |
Short-term borrowings | 30,761 |
Junior subordinated debt owed to unconsolidated trusts | 71,230 | 71,155
Level 1 | Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 420,207 | 239,973
Level 1 | Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 420,207 | 239,973
Level 2 | Carrying Amount |  |
Financial assets: |  |
Securities held to maturity | 15,708 | 608,660
Accrued interest receivable | 28,614 | 22,314
Financial liabilities: |  |
Time deposits | 1,749,811 | 1,497,003
Securities sold under agreements to repurchase | 190,846 | 185,796
Short-term borrowings | 30,761 |
Long-term debt | 86,772 | 50,000
Junior subordinated debt owed to unconsolidated trusts | 71,230 | 71,155
Accrued interest payable | 7,380 | 6,568
Level 2 | Fair Value |  |
Financial assets: |  |
Securities held to maturity | 15,934 | 603,360
Accrued interest receivable | 28,614 | 22,314
Financial liabilities: |  |
Time deposits | 1,747,766 | 1,482,301
Securities sold under agreements to repurchase | 190,846 | 185,796
Short-term borrowings | 30,748 |
Long-term debt | 86,873 | 49,873
Junior subordinated debt owed to unconsolidated trusts | 65,073 | 65,182
Accrued interest payable | 7,380 | 6,568
Level 3 | Carrying Amount |  |
Financial assets: |  |
Portfolio loans, net | 6,480,751 | 5,517,780
Mortgage servicing rights | 8,692 | 3,315
Other servicing rights | 845 | 781
Level 3 | Fair Value |  |
Financial assets: |  |
Portfolio loans, net | 6,447,502 | 5,473,063
Mortgage servicing rights | 12,772 | 11,051
Other servicing rights | 1,434 | 1,443
Level 3 | Senior notes | Carrying Amount |  |
Financial liabilities: |  |
Long-term debt | 39,607 | 39,539
Level 3 | Senior notes | Fair Value |  |
Financial liabilities: |  |
Long-term debt | 40,419 | 39,452
Level 3 | Subordinated debt | Carrying Amount |  |
Financial liabilities: |  |
Long-term debt | 59,197 | 59,147
Level 3 | Subordinated debt | Fair Value |  |
Financial liabilities: |  |
Long-term debt | $ 59,719 | $ 58,186

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