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Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Aging [Abstract]    
Minimum number of days past due for nonaccrual loan status 90 days  
Total past due accruing $ 34,353 $ 41,730
Nonaccrual 24,006 25,708
Current 6,800,704 6,517,335
Recorded total loans 6,859,063 6,584,773
31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 25,810 29,662
61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 6,334 6,658
Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,209 5,410
Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Recorded total loans 3,190,556 3,028,269
Consumer Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Recorded total loans 2,317,746 2,234,809
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Recorded total loans 1,350,761 1,321,695
Originated Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 32,583 39,945
Nonaccrual 21,461 23,336
Current 6,447,030 6,119,801
Recorded total loans 6,501,074 6,183,082
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 24,164 28,383
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 6,210 6,397
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,209 5,165
Originated Loans [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 5,264 3,413
Nonaccrual 11,173 12,463
Current 3,011,903 2,825,080
Recorded total loans 3,028,340 2,840,956
Originated Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 4,330 2,678
Originated Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 934 735
Originated Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 0
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,789  
Nonaccrual 1,041  
Current 833,557  
Recorded total loans 836,387  
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,395  
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 394  
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,846  
Nonaccrual 4,085  
Current 1,704,773  
Recorded total loans 1,710,704  
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,846  
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Nonaccrual   202
Current   753,577
Recorded total loans   753,779
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   299
Nonaccrual   3,178
Current   1,533,065
Recorded total loans   1,536,542
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   161
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   138
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   117
Nonaccrual   1,043
Current   34,386
Recorded total loans   35,546
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   117
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   493
Nonaccrual   2,736
Current   30,905
Recorded total loans   34,134
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   493
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,629 2,504
Nonaccrual 6,047 5,304
Current 473,573 473,147
Recorded total loans 481,249 480,955
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,089 1,907
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 540 597
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 0
Originated Loans [Member] | Consumer Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 24,060 30,873
Nonaccrual 4,688 4,886
Current 2,252,133 2,155,144
Recorded total loans 2,280,881 2,190,903
Originated Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 17,357 21,975
Originated Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 4,530 4,995
Originated Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,173 3,903
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   26,272
Nonaccrual   2,115
Current   1,642,664
Recorded total loans   1,671,051
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   18,747
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   4,033
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   3,492
Originated Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 14,610  
Nonaccrual 1,972  
Current 1,235,983  
Recorded total loans 1,252,565  
Originated Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 11,909  
Originated Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,956  
Originated Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 745  
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 3,463  
Nonaccrual 2,716  
Current 514,519  
Recorded total loans 520,698  
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,488  
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 653  
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 322  
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 5,987  
Nonaccrual 0  
Current 501,631  
Recorded total loans 507,618  
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,960  
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,921  
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,106  
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   4,082
Nonaccrual   2,736
Current   448,081
Recorded total loans   454,899
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   2,887
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   854
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   341
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   519
Nonaccrual   35
Current   64,399
Recorded total loans   64,953
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   341
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   108
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   70
Originated Loans [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 3,259 5,659
Nonaccrual 5,600 5,987
Current 1,182,994 1,139,577
Recorded total loans 1,191,853 1,151,223
Originated Loans [Member] | Residential Real Estate [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,477 3,730
Originated Loans [Member] | Residential Real Estate [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 746 667
Originated Loans [Member] | Residential Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 36 1,262
Acquired Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,770 1,785
Nonaccrual 2,545 2,372
Current 353,674 397,534
Recorded total loans 357,989 401,691
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,646 1,279
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 124 261
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 245
Acquired Loans [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 522 354
Nonaccrual 605 671
Current 161,089 186,288
Recorded total loans 162,216 187,313
Acquired Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 442 354
Acquired Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 80 0
Acquired Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 0
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Nonaccrual 0  
Current 34,054  
Recorded total loans 34,054  
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Nonaccrual 2  
Current 90,049  
Recorded total loans 90,051  
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Nonaccrual   0
Current   39,575
Recorded total loans   39,575
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Nonaccrual   2
Current   106,632
Recorded total loans   106,634
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 522 354
Nonaccrual 603 669
Current 36,986 40,081
Recorded total loans 38,111 41,104
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 442 354
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 80 0
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 0
Acquired Loans [Member] | Consumer Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 276 438
Nonaccrual 328 270
Current 36,261 43,198
Recorded total loans 36,865 43,906
Acquired Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 232 298
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 44 35
Acquired Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 105
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   39
Nonaccrual   22
Current   1,157
Recorded total loans   1,218
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   38
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   0
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   1
Acquired Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 5  
Nonaccrual 14  
Current 259  
Recorded total loans 278  
Acquired Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 5  
Acquired Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0  
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 271 8
Nonaccrual 314 23
Current 36,002 2,785
Recorded total loans 36,587 2,816
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 227 6
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 44 1
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 1
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   391
Nonaccrual   225
Current   39,256
Recorded total loans   39,872
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   254
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   34
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing   103
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Recorded total loans   2,816
Acquired Loans [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 972 993
Nonaccrual 1,612 1,431
Current 156,324 168,048
Recorded total loans 158,908 170,472
Acquired Loans [Member] | Residential Real Estate [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 972 627
Acquired Loans [Member] | Residential Real Estate [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 0 226
Acquired Loans [Member] | Residential Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing $ 0 $ 140