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Fair Value Measurements - Fair Value Measurement on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale $ 920,737 $ 810,530
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 83,798 13,442
Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 164,072 250,015
Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 311,916 280,211
Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 309,114 217,079
Collateralized loan obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 967 4,580
Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 25,709 16,770
Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 25,161 28,433
Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 920,737 810,530
Derivative assets - interest rate swaps 7,659 3,418
Derivative liabilities - interest rate swaps 7,659 3,418
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 83,798 13,442
Recurring | Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 164,072 250,015
Recurring | Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 311,916 280,211
Recurring | Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 309,114 217,079
Recurring | Collateralized loan obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 967 4,580
Recurring | Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 25,709 16,770
Recurring | Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 25,161 28,433
Recurring | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 15,879 146
Derivative assets - interest rate swaps 0 0
Derivative liabilities - interest rate swaps 0 0
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 15,879 0
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 | Collateralized loan obligations    
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 0 146
Recurring | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 904,858 810,384
Derivative assets - interest rate swaps 7,659 3,418
Derivative liabilities - interest rate swaps 7,659 3,418
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 67,919 13,442
Recurring | Level 2 | Municipal securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 164,072 250,015
Recurring | Level 2 | Residential    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 311,916 280,211
Recurring | Level 2 | Commercial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 309,114 217,079
Recurring | Level 2 | Collateralized loan obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 967 4,580
Recurring | Level 2 | Corporate obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 25,709 16,770
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 25,161 28,287
Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total investment securities available for sale 0 0
Derivative assets - interest rate swaps 0 0
Derivative liabilities - interest rate swaps 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 | Collateralized loan obligations    
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