LHFI and Allowance for Loan Losses, LHFI - Additional Information (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) KeyRatio LoanPool CreditRiskGrade	Dec. 31, 2014 USD ($)
Financing Receivable, Recorded Investment, Aging [Abstract]
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy	90 days
Number of key quality ratios | KeyRatio	6
LHFS past due 90 days or more	$ 21,800	$ 25,900
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program	100.00%
Amount of delinquent loans repurchased	$ 28,500
Repurchase gain included in gain on sales of loans	$ 304
Financing Receivable [Abstract]
Number of primary commercial loan groups | LoanPool	9
Number of individual credit risk grades | CreditRiskGrade	10
Minimum [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loan amount used as baseline in credit quality review for loan policy	$ 1,000
Financing Receivable [Abstract]
Period to conduct asset review	6 months
Credit amount used as baseline in evaluating non-owner occupied commercial real estate for loan policy	$ 100
Maximum [Member]
Financing Receivable [Abstract]
Period to conduct asset review	18 months