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Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financial Instruments Pledged as Collateral [Abstract]    
Carrying value of investment securities available-for-sale pledged as collateral under repurchase agreements $ 317,100 $ 264,900
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 296,007 226,917
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 119,406 101,674
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 11,000 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 52,000 7,243
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 113,601 118,000
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 55,039 77,433
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 16,928 15,001
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 1,723 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 12,540 3,479
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 23,848 58,953
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 67,267 64,126
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 56,627 51,193
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 102 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 1,198 1,768
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 9,340 11,165
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 173,701 85,358
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 45,851 35,480
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 9,175 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 38,262 1,996
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 $ 80,413 $ 47,882