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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 | 6 Months Ended | 12 Months Ended
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Jun. 30, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | $ 1,761 | $ 2,915
TDR loans in forbearance | 56,008 | 18,620
TDR loans in repayment and percentage of each status: |  |
Loans current | 116,609 | 34,554
Total TDR loans in repayment | 129,374 | 37,867
Total TDR loans, gross | $ 187,143 | $ 59,402
Loans current, in percentage | 90.10% | 91.20%
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 | $ 7,561 | $ 1,953
Loans delinquent, in percentage | 5.80% | 5.20%
Loans delinquent 61-90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 4,092 | $ 983
Loans delinquent, in percentage | 3.20% | 2.60%
Loans delinquent greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 1,112 | $ 377
Loans delinquent, in percentage | 0.90% | 1.00%

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