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Loans (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans and Leases Receivable, Deferred Income | $ 10,300 |  | $ 10,400
Troubled Debt Restructuring, Classification removed | 806 |  |
Partial Charge-Offs On Impaired Loans | 28,422 |  | 28,705
Impaired Financing Receivable, Related Allowance | 4,930 |  | 4,191
Recorded investment, related to loans | 13,500 |  | 19,900
Troubled Debt Restructuring Included In Nonaccrual Loans | 49,400 |  | 41,100
TDRs included in accruing loan totals | 15,100 |  | 25,100
Nonaccrual Trouble Debt Restructuring Current | 35,900 |  | 19,100
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 2,700 |  | 2,300
Specific reserves related to troubled debt restructuring | 2,600 |  | 2,300
Additional Specific Reserves Related To Troubled Debt Restructuring | 25 | $ 857 |
Modified substandard commercial loans, total recorded investment | 0 | 131 |
Modified substandard consumer loans, total recorded investment | 2,000 | 4,500 |
Loan Modifications on Nonacrrual status | $ 922 | 1,100 |
Loan past due period before entering default status | 30 days |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | $ 1,095 | $ 1,116 |
Deposit Liabilities Reclassified as Loans Receivable | 1,900 |  | 1,700
Financing Receivable With No Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial Charge-Offs On Impaired Loans | 24,000 |  | 24,200
Financing Receivable With A Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial Charge-Offs On Impaired Loans | 4,400 |  | 4,500
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 0 |  | 0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 593 |  | $ 381
Accruing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans modified during period | 37 |  |
Nonaccrual [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans modified during period | $ 1,100 |  |

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