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Fair Value Measurements - Fair Value Measurement on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale $ 960,680 $ 976,095
U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 92,877 101,603
Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 132,741 158,864
Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 347,682 331,602
Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 339,078 333,761
Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 24,158 25,563
Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 24,144 24,702
Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 960,680 976,095
Equity security 128 114
Recurring | U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 92,877 101,603
Recurring | Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 132,741 158,864
Recurring | Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 347,682 331,602
Recurring | Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 339,078 333,761
Recurring | Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 24,158 25,563
Recurring | Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 24,144 24,702
Recurring | Interest rate swap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative assets - interest rate swaps 8,033 5,095
Derivative liabilities - interest rate swaps 8,033 5,095
Recurring | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 16,059 15,936
Equity security 128 114
Recurring | Level 1 | U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 16,059 15,936
Recurring | Level 1 | Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 1 | Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 1 | Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 1 | Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 1 | Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 1 | Interest rate swap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative assets - interest rate swaps 0 0
Derivative liabilities - interest rate swaps 0 0
Recurring | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 944,621 960,159
Equity security 0 0
Recurring | Level 2 | U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 76,818 85,667
Recurring | Level 2 | Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 132,741 158,864
Recurring | Level 2 | Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 347,682 331,602
Recurring | Level 2 | Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 339,078 333,761
Recurring | Level 2 | Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 24,158 25,563
Recurring | Level 2 | Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 24,144 24,702
Recurring | Level 2 | Interest rate swap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative assets - interest rate swaps 8,033 5,095
Derivative liabilities - interest rate swaps 8,033 5,095
Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Equity security 0 0
Recurring | Level 3 | U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 3 | Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 3 | Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 3 | Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 3 | Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 3 | Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Recurring | Level 3 | Interest rate swap    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative assets - interest rate swaps 0 0
Derivative liabilities - interest rate swaps $ 0 $ 0