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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 494  
Due after one year through five years 6,910  
Due after five years through ten years 6,202  
Due after ten years 278,624  
Debt securities excluding securities not due at a single maturity date 292,230  
Total $ 546,867 $ 537,645
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 0.56%  
Due after one year through five years (as a percent) 2.00%  
Due after five years through ten years (as a percent) 3.25%  
Due after ten years (as a percent) 3.02%  
Debt securities (as a percent) 2.99%  
Total (as a percent) 3.41%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 495  
Due after one year through five years 6,861  
Due after five years through ten years 6,275  
Due after ten years 275,310  
Debt securities 288,941  
Fair Value 541,248 541,439
Collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Total 66,494 66,892
Securities Available-for-Sale, Fair Value    
Fair Value 64,429 65,939
Asset-backed securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 108,574  
Total $ 108,574 113,983
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.65%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 109,514  
Fair Value 109,514 112,932
Collateralized loan obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 65,162  
Total $ 65,162 54,271
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 5.05%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 64,289  
Fair Value 64,289 $ 54,421
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 80,901  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.24%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 78,504