CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 71,529	$ 88,075	$ 95,916
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization on loans	10,769	11,625	11,738
Net amortization on securities and borrowings	8,806	8,921	9,021
Net provision for loan and real estate losses credited to operations	(8,076)	(10,488)	(8,113)
Depreciation and amortization	14,456	13,069	11,872
Net gain on sales of loans and securities	(2,367)	(2,070)	(1,012)
Mortgage servicing rights amortization and valuation allowance adjustments, net	2,185	1,739	2,522
Stock-based compensation	4,103	11,411	8,672
Deferred income tax expense (benefit)	7,254	(2,686)	4,811
Originations of loans held-for-sale	(129,719)	(127,746)	(105,176)
Proceeds from sales and principal repayments of loans held-for-sale	126,810	128,537	104,947
Decrease in accrued interest receivable	2	1,632	1,298
Bank owned life insurance income and insurance proceeds received, net	(1,418)	(8,878)	(7,393)
Decrease (increase) in other assets	4,015	4,301	(15,218)
(Decrease) increase in accrued expenses and other liabilities	(3,330)	(10,233)	20,191
Net cash provided by operating activities	105,019	107,209	134,076
Cash flows from investing activities:
Originations of loans receivable	(1,243,791)	(1,446,856)	(1,560,090)
Loan purchases through third parties	(377,655)	(229,419)	(196,283)
Principal payments on loans receivable	2,328,569	2,450,264	1,985,246
Proceeds from sales of delinquent and non-performing loans	3,049	7,483	181,295
Purchases of securities held-to-maturity	(1,347,939)	(685,918)	(630,366)
Purchases of securities available-for-sale	(30,000)	(125,674)	(25,479)
Principal payments on securities held-to-maturity	897,280	515,441	338,691
Principal payments on securities available-for-sale	142,515	70,799	40,906
Proceeds from sales of securities available-for-sale	23,065	19,026	14,447
Purchases of Federal Home Loan Bank of New York stock	(95,561)	(81,536)	(117,294)
Redemptions of Federal Home Loan Bank of New York stock	101,891	91,153	128,747
Proceeds from sales of real estate owned, net	16,858	22,895	49,089
Purchases of premises and equipment, net of proceeds from sales	(5,719)	(11,225)	(10,961)
Net cash provided by investing activities	412,562	596,433	197,948
Cash flows from financing activities:
Net decrease in deposits	(228,972)	(398,882)	(350,401)
Net (decrease) increase in borrowings with original terms of three months or less	(510,000)	(394,000)	200,000
Proceeds from borrowings with original terms greater than three months	2,675,000	470,000	0
Repayments of borrowings with original terms greater than three months	(2,495,000)	(300,000)	(150,000)
Net (decrease) increase in mortgage escrow funds	(2,460)	35	5,942
Proceeds from sales of treasury stock	159	6,168	8,121
Cost to repurchase common stock	0	(6,869)	0
Payments relating to treasury shares received for restricted stock award tax payments	(1,913)	0	0
Cash dividends paid to stockholders	(24,989)	(24,856)	(24,643)
Net tax benefit excess from stock-based compensation	0	2,115	192
Net cash used in financing activities	(588,175)	(646,289)	(310,789)
Net (decrease) increase in cash and cash equivalents	(70,594)	57,353	21,235
Cash and cash equivalents at beginning of year	200,538	143,185	121,950
Cash and cash equivalents at end of year	129,944	200,538	143,185
Supplemental disclosures:
Interest paid	121,544	132,687	150,026
Income taxes paid	28,167	35,925	21,658
Additions to real estate owned	13,279	8,554	43,532
Loans transferred to held-for-sale	$ 1,872	$ 8,948	$ 190,594