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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Securities [Abstract]    
Percentage of total investment with unrealized losses 90.50% 69.50%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 224,947 $ 241,239
12 months or more 304,984 173,642
Total 529,931 414,881
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (3,486) (2,004)
12 months or more (10,915) (5,054)
Total (14,401) (7,058)
Available-for-sale, fair value [Abstract]    
Less than 12 months 221,461 239,235
12 months or more 294,069 168,588
Total 515,530 407,823
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 132,224 136,688
12 months or more 113,929 23,885
Total 246,153 160,573
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,300) (840)
12 months or more (2,054) (332)
Total (3,354) (1,172)
Available-for-sale, fair value [Abstract]    
Less than 12 months 130,924 135,848
12 months or more 111,875 23,553
Total 242,799 159,401
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 59,535 34,283
12 months or more 29,021 16,930
Total 88,556 51,213
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,511) (416)
12 months or more (2,400) (745)
Total (3,911) (1,161)
Available-for-sale, fair value [Abstract]    
Less than 12 months 58,024 33,867
12 months or more 26,621 16,185
Total 84,645 50,052
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 32,681 62,768
12 months or more 162,034 117,827
Total 194,715 180,595
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (674) (643)
12 months or more (6,461) (3,364)
Total (7,135) (4,007)
Available-for-sale, fair value [Abstract]    
Less than 12 months 32,007 62,125
12 months or more 155,573 114,463
Total 187,580 176,588
Other Debt Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 507  
12 months or more 0  
Total 507  
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1)  
12 months or more 0  
Total (1)  
Available-for-sale, fair value [Abstract]    
Less than 12 months 506  
12 months or more 0  
Total $ 506  
Debt Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months   233,739
12 months or more   158,642
Total   392,381
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months   (1,899)
12 months or more   (4,441)
Total   (6,340)
Available-for-sale, fair value [Abstract]    
Less than 12 months   231,840
12 months or more   154,201
Total   386,041
CRA Investments Funds [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months   7,500
12 months or more   15,000
Total   22,500
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months   (105)
12 months or more   (613)
Total   (718)
Available-for-sale, fair value [Abstract]    
Less than 12 months   7,395
12 months or more   14,387
Total   $ 21,782