Loans Receivable, Net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans Receivable
Number of segments in loan portfolio	3
Percentage of consolidated stockholders equity exceeding which no borrower had outstanding loans or commitments	10.00%
Variable rate loans	$ 3,298,198,000
Fixed rate loans	1,780,483,000
Loan sold and serviced for others	128,499,000	$ 133,768,000	$ 148,376,000
Loans pledged as collateral	2,899,827,000
Aggregate amount of loans outstanding to related parties	57,764,000	55,427,000
New loans to related parties	10,435,000
Repayments of loans by related parties	8,098,000
Interest income that would have been recorded on non-accrual loans	2,471,000	3,005,000	4,122,000
TDR With Pre Modification Loan Balance for Which Oreo Was Received	8,893,000	12,674,000	18,345,000
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process	3,253,000	698,000
OREO Secured by Residential Real Estate	1,496,000	2,322,000
Additional outstanding commitments on TDRs	2,803,000	4,263,000
Charge-offs on TDRs	$ 1,310,000	$ 1,361,000	$ 1,945,000