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Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments Pledged as Collateral [Abstract]    
Carrying value of investment securities available for sale pledged as collateral under repurchase agreements $ 264,900 $ 285,200
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 226,917 232,712
Overnight and Continuous [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 101,674 106,286
Up to 30 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 0 0
30-90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 7,243 7,420
Greater Than 90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 118,000 119,006
U.S. Treasury and Government Agencies [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 77,433 88,593
U.S. Treasury and Government Agencies [Member] | Overnight and Continuous [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 15,001 25,346
U.S. Treasury and Government Agencies [Member] | Up to 30 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 0 0
U.S. Treasury and Government Agencies [Member] | 30-90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 3,479 2,548
U.S. Treasury and Government Agencies [Member] | Greater Than 90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 58,953 60,699
State and Political Subdivisions [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 64,126 72,243
State and Political Subdivisions [Member] | Overnight and Continuous [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 51,193 58,864
State and Political Subdivisions [Member] | Up to 30 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 0 0
State and Political Subdivisions [Member] | 30-90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 1,768 2,995
State and Political Subdivisions [Member] | Greater Than 90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 11,165 10,384
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 85,358 71,876
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | Overnight and Continuous [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 35,480 22,076
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | Up to 30 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 0 0
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | 30-90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 1,996 1,877
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | Greater Than 90 Days [Member]    
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions $ 47,882 $ 47,923