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Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financial Instruments Pledged as Collateral [Abstract]    
Carrying value of investment securities available-for-sale pledged as collateral under repurchase agreements $ 262,800 $ 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 228,755 232,712
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 103,526 106,286
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 31,000 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 0 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 94,229 119,006
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 76,452 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 15,873 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 11,643 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 0 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 48,936 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 64,530 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 51,888 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 2,691 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 0 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 9,951 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 87,773 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 35,765 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 16,666 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 0 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 $ 35,342 $ 47,923