Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Non-accrual Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases $ 25,194 $ 22,298  
Foreclosed properties, net 1,472 1,677  
Total non-performing assets 26,666 23,975  
Performing troubled debt restructurings 717 1,735 $ 2,003
Total impaired assets $ 27,383 $ 25,710  
Total non-accrual loans and leases to gross loans and leases 1.74% 1.56%  
Total non-performing assets to total gross loans and leases plus foreclosed properties, net 1.83% 1.67%  
Total non-performing assets to total assets 1.50% 1.35%  
Allowance for loan and lease losses to gross loans and leases 1.44% 1.14%  
Allowance for loan and lease losses to non-accrual loans and leases 83.00% 73.17%  
Commercial real estate — owner occupied      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases $ 2,223 $ 2,907  
Commercial real estate — non-owner occupied      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 1,609 1,678  
Land development      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 3,440 4,393  
Construction      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 2,918 397  
Multi-family      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 0 2  
1-4 family      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 1,937 2,550  
Total commercial real estate      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases $ 12,127 $ 11,927  
Allowance for loan and lease losses to gross loans and leases 1.31% 1.24%  
Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases $ 12,463 $ 9,136  
Direct financing leases, net      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 0 38  
Home equity and second mortgages      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 0 542  
Other      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases 604 655  
Total consumer and other loans      
Financing Receivable, Impaired [Line Items]      
Non-accruing loans and leases $ 604 $ 1,197  
Allowance for loan and lease losses to gross loans and leases 2.26% 2.89%