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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | $ 22,544 | $ 6,869
TDR loans in forbearance | 72,386 | 43,756
TDR loans in repayment and percentage of each status: |  |
Loans current | 366,000 | 185,936
Total TDR loans in repayment | 408,702 | 215,206
Total TDR loans, gross | $ 503,632 | $ 265,831
Loans current (as a percentage) | 89.60% | 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 | $ 21,781 | $ 14,948
Loans delinquent (as a percentage) | 5.30% | 6.90%
Loans delinquent 61-90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 13,411 | $ 9,239
Loans delinquent (as a percentage) | 3.30% | 4.30%
Loans delinquent greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 7,510 | $ 5,083
Loans delinquent (as a percentage) | 1.80% | 2.40%

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