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Securities (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 4,313  
Due after one but within five years 30,613  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 77,372  
Due after ten years 136,766  
Total of securities having specified maturity period 249,064  
TOTAL 812,002 $ 811,369
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 562,938  
Fair Value    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 4,321  
Due after one but within five years 31,131  
Due after five but within ten years 78,672  
Due after ten years 142,697  
Total of securities having specified maturities period 256,821  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 548,737  
Securities available-for-sale $ 805,558 $ 814,931