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Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Carrying value of investment securities available for sale pledged as collateral under repurchase agreements $ 288,100 $ 283,300
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract]    
Repurchase agreements and repurchase-to-maturity transactions 251,225 235,186
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 105,670 105,556
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 500 1,000
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 24,335 24,544
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 120,720 104,086
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 78,280 28,700
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 19,184 6,790
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 1,000
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 10,401 6,834
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 48,695 14,076
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 69,985 73,764
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 58,676 59,451
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 494 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 1,656 1,839
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 9,159 12,474
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 102,960 132,722
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 27,810 39,315
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 6 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 12,278 15,871
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 $ 62,866 $ 77,536