Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Assets:
Total securities available-for-sale	$ 524,295	$ 513,201
Interest-rate swaps	24,790	8,656
Liabilities:
Interest-rate swaps	$ 24,790	8,781
Changes in generic pricing of securities period one, considered for analyzing changes in prices obtained from pricing service	15 years
Changes in generic pricing of securities period two, considered for analyzing changes in prices obtained from pricing service	30 years
Recurring basis
Assets:
Interest-rate swaps	$ 24,790	8,656
Liabilities:
Interest-rate swaps	24,790	8,781
Recurring basis | Securities available for sale
Assets:
Total securities available-for-sale	524,295	513,201
Recurring basis | Debt securities
Assets:
Total securities available-for-sale	523,295	512,224
Recurring basis | GSE debentures
Assets:
Total securities available-for-sale	66,339	40,627
Recurring basis | GSE CMOs
Assets:
Total securities available-for-sale	172,805	193,816
Recurring basis | GSE MBSs
Assets:
Total securities available-for-sale	233,423	229,881
Recurring basis | SBA commercial loan asset-backed securities
Assets:
Total securities available-for-sale	111	147
Recurring basis | Corporate debt obligations
Assets:
Total securities available-for-sale	49,304	46,486
Recurring basis | Trust preferred securities
Assets:
Total securities available-for-sale	1,313	1,267
Recurring basis | Marketable equity securities
Assets:
Total securities available-for-sale	1,000	977
Recurring basis | Level 1
Assets:
Interest-rate swaps	0	0
Liabilities:
Interest-rate swaps	0	0
Recurring basis | Level 1 | Securities available for sale
Assets:
Total securities available-for-sale	1,000	977
Recurring basis | Level 1 | Debt securities
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 1 | GSE debentures
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 1 | GSE CMOs
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 1 | GSE MBSs
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 1 | SBA commercial loan asset-backed securities
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 1 | Corporate debt obligations
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 1 | Trust preferred securities
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 1 | Marketable equity securities
Assets:
Total securities available-for-sale	1,000	977
Recurring basis | Level 2
Assets:
Interest-rate swaps	24,790	8,656
Liabilities:
Interest-rate swaps	24,790	8,781
Recurring basis | Level 2 | Securities available for sale
Assets:
Total securities available-for-sale	523,295	512,224
Recurring basis | Level 2 | Debt securities
Assets:
Total securities available-for-sale	523,295	512,224
Recurring basis | Level 2 | GSE debentures
Assets:
Total securities available-for-sale	66,339	40,627
Recurring basis | Level 2 | GSE CMOs
Assets:
Total securities available-for-sale	172,805	193,816
Recurring basis | Level 2 | GSE MBSs
Assets:
Total securities available-for-sale	233,423	229,881
Recurring basis | Level 2 | SBA commercial loan asset-backed securities
Assets:
Total securities available-for-sale	111	147
Recurring basis | Level 2 | Corporate debt obligations
Assets:
Total securities available-for-sale	49,304	46,486
Recurring basis | Level 2 | Trust preferred securities
Assets:
Total securities available-for-sale	1,313	1,267
Recurring basis | Level 2 | Marketable equity securities
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3
Assets:
Interest-rate swaps	0	0
Liabilities:
Interest-rate swaps	0	0
Recurring basis | Level 3 | Securities available for sale
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | Debt securities
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | GSE debentures
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | GSE CMOs
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | GSE MBSs
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | SBA commercial loan asset-backed securities
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | Corporate debt obligations
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | Trust preferred securities
Assets:
Total securities available-for-sale	0	0
Recurring basis | Level 3 | Marketable equity securities
Assets:
Total securities available-for-sale	$ 0	$ 0