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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Securities [Abstract]    
Percentage of total investment with unrealized losses 42.80% 75.70%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 85,046 $ 163,059
12 months or more 173,948 297,524
Total 258,994 460,583
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (561) (848)
12 months or more (1,400) (8,598)
Total (1,961) (9,446)
Available-for-sale, fair value [Abstract]    
Less than 12 months 84,485 162,211
12 months or more 172,548 288,926
Total 257,033 451,137
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 25,955 78,905
12 months or more 82,339 97,955
Total 108,294 176,860
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (148) (271)
12 months or more (428) (1,197)
Total (576) (1,468)
Available-for-sale, fair value [Abstract]    
Less than 12 months 25,807 78,634
12 months or more 81,911 96,758
Total 107,718 175,392
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 8,356 21,707
12 months or more 0 51,911
Total 8,356 73,618
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (37) (194)
12 months or more 0 (2,231)
Total (37) (2,425)
Available-for-sale, fair value [Abstract]    
Less than 12 months 8,319 21,513
12 months or more 0 49,680
Total 8,319 71,193
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 19,317 61,940
12 months or more 91,609 147,658
Total 110,926 209,598
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (100) (377)
12 months or more (972) (5,170)
Total (1,072) (5,547)
Available-for-sale, fair value [Abstract]    
Less than 12 months 19,217 61,563
12 months or more 90,637 142,488
Total 109,854 204,051
Other Debt Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 31,418 507
12 months or more 0 0
Total 31,418 507
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (276) (6)
12 months or more 0 0
Total (276) (6)
Available-for-sale, fair value [Abstract]    
Less than 12 months 31,142 501
12 months or more 0 0
Total $ 31,142 $ 501