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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Securities available for sale | $ 670,328 | $ 641,382
State tax credits held for sale | 171 | 400
Portion at Other than Fair Value, Fair Value Disclosure |  |
Assets |  |
State tax credits held for sale | 45,500 |
Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 670,328 | 641,382
State tax credits held for sale | 48,622 | 44,271
Derivative financial instruments | 4,895 | 3,589
Liabilities |  |
Derivative financial instruments | 4,895 | 3,589
Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 97,681 | 99,224
Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 30,533 | 34,642
Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 532,347 | 507,516
US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | 9,767 |
Recurring basis | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 670,328 | 641,382
State tax credits held for sale | 171 | 400
Other Investments | 144 |
Derivative financial instruments | 4,895 | 3,589
Total assets | 675,538 | 645,371
Liabilities |  |
Derivative financial instruments |  | 3,589
Total liabilities | 4,895 | 3,589
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 97,681 | 99,224
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 30,533 | 34,642
Recurring basis | Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 532,347 | 507,516
Recurring basis | US Treasury Bill Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Securities available for sale | 9,767 |
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
Other Investments | 144 |
Derivative financial instruments | 0 | 0
Total assets | 144 | 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 | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | 0 |
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Securities available for sale | 670,328 | 641,382
State tax credits held for sale | 0 | 0
Other Investments | 0 |
Derivative financial instruments | 4,895 | 3,589
Total assets | 675,223 | 644,971
Liabilities |  |
Derivative financial instruments | 4,895 | 3,589
Total liabilities | 4,895 | 3,589
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises |  |
Assets |  |
Securities available for sale | 97,681 | 99,224
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets |  |
Securities available for sale | 30,533 | 34,642
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 532,347 | 507,516
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | 9,767 |
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Securities available for sale | 0 | 0
State tax credits held for sale | 171 | 400
Other Investments | 0 |
Derivative financial instruments | 0 | 0
Total assets | 171 | 400
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 | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets |  |
Securities available for sale | 0 | $ 0
Recurring basis | Significant Unobservable Inputs (Level 3) | US Treasury Bill Securities [Member] |  |
Assets |  |
Securities available for sale | $ 0 |

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