Federal Home Loan Bank and Federal Reserve Bank Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
FHLB Fixed Rate Advances, Maturities Summary [Abstract]
FHLB Fixed Rate Advances, Weighted Average Interest Rate, Within 1 year	0.34%
FHLB Fixed Rate Advances, Amount, Within 1 year	$ 62,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One To Five Years From Balance Sheet Date	5.66%
FHLB Fixed Rate Advances, Over 1 through 5 years	$ 1,000
FHLB Fixed Rate Advances, Weighted Average Interest Rate, Due after 10 years	5.37%
FHLB Fixed Rate Advances, Due after 10 years	$ 5,000
FHLB Fixed Rate Advances, Total Amount before valuation adjustment	68,000
Valuation adjustment from acquisition accounting	531
FHLB Fixed Rate Advances, Total Amount	68,531
Federal Home Loan Bank, Advances, Activity for Year [Abstract]
FHLB Advances	68,531	$ 216,568	$ 36,606
Average balance during the year	70,678	44,876	51,030
Maximum month-end balance during the year	$ 242,556	$ 216,568	$ 190,631
Weighted average rate during the year	0.68%	0.74%	1.12%
Weighted average rate at December 31	0.79%	0.41%	1.09%
FHLB Advances, Collateral Pledged	$ 1,399,201	$ 1,083,879
FHLB Borrowing Capacity	1,328,971	865,138
Federal Reserve Bank, Advances, Activity for Year [Abstract]
Federal Reserve Bank, Advances, Collateral Pledged	85,428	86,130
Federal Reserve Bank borrowing capacity	85,428	86,130
Securities Investment [Member]
Federal Reserve Bank, Advances, Activity for Year [Abstract]
Federal Reserve Bank, Advances, Collateral Pledged	47,516	40,128
Loans Receivable [Member]
Federal Home Loan Bank, Advances, Activity for Year [Abstract]
FHLB Advances, Collateral Pledged	1,399,201	1,083,879
Commercial Loan [Member]
Federal Reserve Bank, Advances, Activity for Year [Abstract]
Federal Reserve Bank, Advances, Collateral Pledged	$ 37,912	$ 46,002