Parent Company Financial Information STATEMENTS OF FINANCIAL CONDITION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Percentage of capital stock of the Bank held	100.00%
Assets:
Deferred income taxes	$ 11,511	$ 9,383	$ 8,477
Other assets	24,005	10,743
TOTAL ASSETS	2,790,646	2,038,897
Liabilities:
Subordinated debentures	70,310	70,310
Accrued expenses and other liabilities	30,108	21,526
Total liabilities	2,491,666	1,839,305
Total Stockholders’ Equity	298,980	199,592	$ 175,226	$ 134,517
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	2,790,646	2,038,897
Corporation
Assets:
Cash and cash equivalents	3,412	18,724
Deferred income taxes	0	3,566
Investment in subsidiaries	359,143	247,669
Other assets	8,502	1,544
TOTAL ASSETS	371,057	271,503
Liabilities:
Subordinated debentures	70,310	70,310
Accrued expenses and other liabilities	1,767	1,601
Total liabilities	72,077	71,911
Total Stockholders’ Equity	298,980	199,592
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 371,057	$ 271,503