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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Securities Available-for-Sale, Amortized Cost      
Due in one year or less $ 10,550    
Due after one year through five years 4,689    
Due after five years through ten years 5,343    
Due after ten years 275,483    
Debt securities excluding securities not due at a single maturity date 296,065    
Total $ 550,396 $ 550,396 $ 537,645
Securities Available-for-Sale, Weighted Average Yield      
Due in one year or less (as a percent) 2.10%    
Due after one year through five years (as a percent) 2.20%    
Due after five years through ten years (as a percent) 3.27%    
Due after ten years (as a percent) 2.98%    
Debt securities (as a percent) 2.94%    
Total (as a percent) 3.19%    
Securities Available-for-Sale, Fair Value      
Due in one year or less $ 10,540    
Due after one year through five years 4,576    
Due after five years through ten years 5,413    
Due after ten years 272,375    
Debt securities 292,904    
Fair Value 543,644 543,644 541,439
Collateralized mortgage obligations      
Securities Available-for-Sale, Amortized Cost      
Total   63,778 66,892
Securities Available-for-Sale, Fair Value      
Fair Value   61,432 65,939
Asset-backed securities      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 110,053    
Total   110,053 113,983
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.23%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 109,263    
Fair Value   109,263 112,932
Collateralized loan obligations      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 66,489    
Total   66,489 54,271
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 4.34%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 66,638    
Fair Value   $ 66,638 $ 54,421
Mortgage-backed and collateralized mortgage obligations      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 77,789    
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.11%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 74,839