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Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 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 $ 34,955 $ 41,730
Nonaccrual 25,426 25,708
Current 6,586,743 6,517,335
Recorded total loans 6,647,124 6,584,773
31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 23,678 29,662
61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 8,343 6,658
Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,934 5,410
Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Recorded total loans 3,048,003 3,028,269
Consumer Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Recorded total loans 2,266,054 2,234,809
Residential Real Estate Mortgages [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Recorded total loans 1,333,067 1,321,695
Originated Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 33,311 39,945
Nonaccrual 22,780 23,336
Current 6,213,324 6,119,801
Recorded total loans 6,269,415 6,183,082
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 22,199 28,383
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 8,229 6,397
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,883 5,165
Originated Loans [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 4,848 3,413
Nonaccrual 12,622 12,463
Current 2,857,613 2,825,080
Recorded total loans 2,875,083 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 2,783 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 2,065 735
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 1,907  
Nonaccrual 1,196  
Current 784,845  
Recorded total loans 787,948  
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 639  
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 1,268  
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 28  
Nonaccrual 5,232  
Current 1,600,096  
Recorded total loans 1,605,356  
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 28  
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 2,913 2,504
Nonaccrual 6,194 5,304
Current 472,672 473,147
Recorded total loans 481,779 480,955
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 2,116 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 797 597
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 24,236 30,873
Nonaccrual 4,671 4,886
Current 2,196,481 2,155,144
Recorded total loans 2,225,388 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 17,027 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 4,529 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 2,680 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 13,757  
Nonaccrual 2,201  
Current 1,224,238  
Recorded total loans 1,240,196  
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 10,850  
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 1,920  
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 987  
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 3,717  
Nonaccrual 2,470  
Current 507,331  
Recorded total loans 513,518  
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 2,334  
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 982  
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 401  
Originated Loans [Member] | Consumer Loans [Member] | Specialty Lending [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 6,762  
Nonaccrual 0  
Current 464,912  
Recorded total loans 471,674  
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 3,843  
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 1,627  
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 1,292  
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 Mortgages [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 4,227 5,659
Nonaccrual 5,487 5,987
Current 1,159,230 1,139,577
Recorded total loans 1,168,944 1,151,223
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 2,389 3,730
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,635 667
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 203 1,262
Acquired Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,644 1,785
Nonaccrual 2,646 2,372
Current 373,419 397,534
Recorded total loans 377,709 401,691
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 1,479 1,279
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 114 261
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 51 245
Acquired Loans [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 548 354
Nonaccrual 675 671
Current 171,697 186,288
Recorded total loans 172,920 187,313
Acquired Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 539 354
Acquired Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 9 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 33,484  
Recorded total loans 33,484  
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 97,463  
Recorded total loans 97,465  
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 548 354
Nonaccrual 673 669
Current 40,750 40,081
Recorded total loans 41,971 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 539 354
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 9 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 429 438
Nonaccrual 296 270
Current 39,941 43,198
Recorded total loans 40,666 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 375 298
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 3 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 51 105
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 10  
Nonaccrual 15  
Current 577  
Recorded total loans 602  
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 7  
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 3  
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 419 8
Nonaccrual 281 23
Current 39,364 2,785
Recorded total loans 40,064 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 368 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 0 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 51 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 Mortgages [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 667 993
Nonaccrual 1,675 1,431
Current 161,781 168,048
Recorded total loans 164,123 170,472
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | 31-60 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 565 627
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | 61-90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing 102 226
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | Greater Than 90 Days Past Due Accruing [Member]    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Total past due accruing $ 0 $ 140