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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Securities available for sale | $ 478,514 | $ 451,770
State tax credits held for sale | 4,774 | 5,941
Portion at Other than Fair Value, Fair Value Disclosure |  |
Assets |  |
State tax credits held for sale | 40,100 |
Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 478,514 | 451,770
State tax credits held for sale | 49,961 | 49,588
Derivative financial instruments | 2,264 | 1,155
Liabilities |  |
Derivative financial instruments | 2,264 | 1,155
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 99,686 | 99,008
Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 38,965 | 41,701
Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 339,863 | 311,061
Recurring basis | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 478,514 | 451,770
State tax credits held for sale | 4,774 | 5,941
Derivative financial instruments | 2,264 | 1,155
Total assets | 485,552 | 458,866
Liabilities |  |
Derivative financial instruments |  | 1,155
Total liabilities | 2,264 | 1,155
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 99,686 | 99,008
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 38,965 | 41,701
Recurring basis | Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 339,863 | 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 | 475,421 | 448,693
State tax credits held for sale | 0 | 0
Derivative financial instruments | 2,264 | 1,155
Total assets | 477,685 | 449,848
Liabilities |  |
Derivative financial instruments | 2,264 | 1,155
Total liabilities | 2,264 | 1,155
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 99,686 | 99,008
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 35,872 | 38,624
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 339,863 | 311,061
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available for sale | 3,093 | 3,077
State tax credits held for sale | 4,774 | 5,941
Derivative financial instruments | 0 | 0
Total assets | 7,867 | 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 | 3,093 | 3,077
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | $ 0 | $ 0

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