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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% |

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