Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 18,565,000	$ 19,307,000
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization on loans	2,310,000	2,883,000
Net amortization on securities and borrowings	1,822,000	2,322,000
Net provision for loan and real estate losses credited to operations	(2,918,000)	(181,000)
Depreciation and amortization	3,694,000	3,024,000
Net gain on sales of loans and securities	(518,000)	(463,000)
Mortgage servicing rights amortization and valuation allowance adjustments, net	1,404,000	1,130,000
Stock-based compensation	1,581,000	1,608,000
Deferred income tax expense	75,000	1,191,000
Originations of loans held-for-sale	(27,258,000)	(27,463,000)
Proceeds from sales and principal repayments of loans held-for-sale	28,288,000	27,585,000
Increase in accrued interest receivable	(1,143,000)	(580,000)
Bank owned life insurance income and insurance proceeds received, net	(2,289,000)	(2,197,000)
Decrease in other assets	2,572,000	2,457,000
Increase (decrease) in accrued expenses and other liabilities	1,219,000	(1,847,000)
Net cash provided by operating activities	27,404,000	28,776,000
Cash flows from investing activities:
Originations of loans receivable	(309,871,000)	(389,387,000)
Loan purchases through third parties	(29,048,000)	(49,855,000)
Principal payments on loans receivable	482,897,000	563,529,000
Proceeds from sales of delinquent and non-performing loans	400,000	5,806,000
Purchases of securities held-to-maturity	(354,392,000)	(93,428,000)
Purchases of securities available-for-sale	0	(37,049,000)
Principal payments on securities held-to-maturity	206,196,000	105,752,000
Principal payments on securities available-for-sale	11,447,000	10,949,000
Proceeds from sales of securities available-for-sale	23,065,000	0
Net purchases of Federal Home Loan Bank of New York stock	(445,000)	(868,000)
Proceeds from sales of real estate owned, net	7,863,000	6,670,000
Purchases of premises and equipment, net of proceeds from sales	(2,108,000)	(2,977,000)
Net cash provided by investing activities	36,004,000	119,142,000
Cash flows from financing activities:
Net decrease in deposits	(54,488,000)	(97,880,000)
Net decrease in borrowings with original terms of three months or less	(270,000,000)	(74,000,000)
Repayments of borrowings with original terms greater than three months	(345,000,000)	0
Proceeds from borrowings with terms greater than three months	550,000,000	0
Net increase in mortgage escrow funds	47,796,000	46,729,000
Proceeds from sales of treasury stock	41,000	6,009,000
Cash dividends paid to stockholders	(6,247,000)	(6,189,000)
Net tax benefit excess (shortfall) from stock-based compensation	3,000	(6,000)
Net cash used in financing activities	(77,895,000)	(125,337,000)
Net (decrease) increase in cash and cash equivalents	(14,487,000)	22,581,000
Cash and cash equivalents at beginning of period	200,538,000	143,185,000
Cash and cash equivalents at end of period	186,051,000	165,766,000
Supplemental disclosures:
Interest paid	27,977,000	31,708,000
Income taxes paid	4,613,000	1,477,000
Additions to real estate owned	965,000	1,269,000
Loans transferred to held-for-sale	$ 0	$ 6,205,000