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Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
loans
Dec. 31, 2016
USD ($)
loans
Dec. 31, 2015
USD ($)
loans
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 143 158 96
Post-Modification Recorded Investment $ 29,634 $ 12,378 $ 14,416
Number of Loans, modified during the year that had a post-modification default 40 45 29
Recorded Investment, modified during the year that had a post-modification default $ 5,875 $ 5,996 $ 5,116
Real estate – commercial mortgage      
Financing Receivable, Modifications [Line Items]      
Number of Loans, modified during the year that had a post-modification default 2 1 4
Recorded Investment, modified during the year that had a post-modification default $ 549 $ 118 $ 359
Real estate – commercial mortgage | Extend maturity with rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 0 0 5
Post-Modification Recorded Investment $ 0 $ 0 $ 2,014
Real estate – commercial mortgage | Extend maturity without rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 9 0 4
Post-Modification Recorded Investment $ 2,899 $ 0 $ 639
Real estate – residential mortgage      
Financing Receivable, Modifications [Line Items]      
Number of Loans, modified during the year that had a post-modification default 5 8 4
Recorded Investment, modified during the year that had a post-modification default $ 577 $ 1,500 $ 445
Real estate – residential mortgage | Extend maturity with rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 2 0 4
Post-Modification Recorded Investment $ 468 $ 0 $ 750
Real estate – residential mortgage | Extend maturity without rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 5 2 3
Post-Modification Recorded Investment $ 1,044 $ 315 $ 262
Real estate – residential mortgage | Bankruptcy      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 3 6 7
Post-Modification Recorded Investment $ 392 $ 981 $ 2,508
Commercial - secured      
Financing Receivable, Modifications [Line Items]      
Number of Loans, modified during the year that had a post-modification default 6 7 8
Recorded Investment, modified during the year that had a post-modification default $ 1,571 $ 2,523 $ 3,549
Commercial - secured | Extend maturity with rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 0 0 2
Post-Modification Recorded Investment $ 0 $ 0 $ 127
Commercial - secured | Extend maturity without rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 23 12 10
Post-Modification Recorded Investment $ 15,058 $ 3,904 $ 3,823
Commercial - secured | Bankruptcy      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 1 0  
Post-Modification Recorded Investment $ 490 $ 0  
Real estate – home equity      
Financing Receivable, Modifications [Line Items]      
Number of Loans, modified during the year that had a post-modification default 25 28 13
Recorded Investment, modified during the year that had a post-modification default $ 1,575 $ 1,836 $ 763
Real estate – home equity | Extend maturity with rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 0 0 2
Post-Modification Recorded Investment $ 0 $ 0 $ 36
Real estate – home equity | Extend maturity without rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 69 89 3
Post-Modification Recorded Investment $ 5,843 $ 4,484 $ 203
Real estate – home equity | Bankruptcy      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 28 47 52
Post-Modification Recorded Investment $ 1,813 $ 2,671 $ 2,501
Construction - commercial residential      
Financing Receivable, Modifications [Line Items]      
Number of Loans, modified during the year that had a post-modification default 1 0 0
Recorded Investment, modified during the year that had a post-modification default $ 1,192 $ 0 $ 0
Construction - commercial residential | Extend maturity without rate concession      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 1 0 1
Post-Modification Recorded Investment $ 1,204 $ 0 $ 1,535
Construction - commercial residential | Bankruptcy      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 1 0  
Post-Modification Recorded Investment $ 411 $ 0  
Construction - other      
Financing Receivable, Modifications [Line Items]      
Number of Loans, modified during the year that had a post-modification default 1 0 0
Recorded Investment, modified during the year that had a post-modification default $ 411 $ 0 $ 0
Consumer - direct | Bankruptcy      
Financing Receivable, Modifications [Line Items]      
Number of loans modified during the year (loans) | loans 0 2 3
Post-Modification Recorded Investment $ 0 $ 23 $ 18
Consumer - indirect:      
Financing Receivable, Modifications [Line Items]      
Number of Loans, modified during the year that had a post-modification default | loans 0 1 0
Recorded Investment, modified during the year that had a post-modification default $ 0 $ 19 $ 0