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Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($)
$ in Thousands
Sep. 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 $ 392,700 $ 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 367,788 226,917
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 108,184 101,674
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 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 100,000 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 128,604 118,000
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 49,933 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 13,457 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 7,031 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 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 29,445 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 68,017 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 55,477 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 1,519 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 3,863 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 7,158 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 249,838 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 39,250 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 22,450 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 96,137 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 $ 92,001 $ 47,882