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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Assets |  |
Securities available for sale | $ 479,609 | $ 451,770
State tax credits held for sale | $ 4,801 | 5,941
Liabilities |  |
State tax credit term | 10 years |
Years of tax credits generated | 10 years |
Portion at Other than Fair Value, Fair Value Disclosure |  |
Assets |  |
State tax credits held for sale | $ 39,400 |
Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 479,609 | 451,770
State tax credits held for sale | 48,959 | 49,588
Derivative financial instruments | 2,099 | 1,155
Liabilities |  |
Derivative financial instruments | 2,099 | 1,155
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 99,058 | 99,008
Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 38,336 | 41,701
Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 342,215 | 311,061
Recurring basis | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 479,609 | 451,770
State tax credits held for sale | 4,801 | 5,941
Derivative financial instruments | 2,099 | 1,155
Total assets | 486,509 | 458,866
Liabilities |  |
Derivative financial instruments |  | 1,155
Total liabilities | 2,099 | 1,155
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 99,058 | 99,008
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 38,336 | 41,701
Recurring basis | Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 342,215 | 311,061
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Securities available for sale | 0 | 0
State tax credits held for sale | 0 | 0
Derivative financial instruments | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Derivative financial instruments | 0 | 0
Total liabilities | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Securities available for sale | 476,515 | 448,693
State tax credits held for sale | 0 | 0
Derivative financial instruments | 2,099 | 1,155
Total assets | 478,614 | 449,848
Liabilities |  |
Derivative financial instruments | 2,099 | 1,155
Total liabilities | 2,099 | 1,155
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 99,058 | 99,008
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 35,242 | 38,624
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 342,215 | 311,061
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available for sale | 3,094 | 3,077
State tax credits held for sale | 4,801 | 5,941
Derivative financial instruments | 0 | 0
Total assets | 7,895 | 9,018
Liabilities |  |
Derivative financial instruments | 0 | 0
Total liabilities | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 3,094 | 3,077
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | $ 0 | $ 0

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