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Allowance for Loan Losses - Loan Status and Aging of Past Due TDR Loans (Details) - Troubled Debt Restructured Loans - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | $ 10,738 | $ 6,869
TDR loans in forbearance | 42,699 | 43,756
TDR loans in repayment and percentage of each status: |  |
Loans current | 232,720 | 185,936
Total TDR loans in repayment | 264,657 | 215,206
Total TDR loans, gross | $ 318,094 | $ 265,831
Loans current, in percentage | 88.00% | 86.40%
Total TDR loans in repayment, in percentage | 100.00% | 100.00%
Loans delinquent 31-60 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 13,610 | $ 14,948
Loans delinquent, in percentage | 5.10% | 6.90%
Loans delinquent 61-90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 11,109 | $ 9,239
Loans delinquent, in percentage | 4.20% | 4.30%
Loans delinquent greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 7,218 | $ 5,083
Loans delinquent, in percentage | 2.70% | 2.40%

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