Consolidated Statements of Cash Flows - USD ($)		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income		$ 64,282,000	$ 68,715,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred loan costs, fees and purchased premiums and discounts		4,748,000	16,000
Net amortization of premiums and discounts on securities		2,219,000	3,497,000
Net amortization of mortgage servicing rights		181,000	200,000
Amortization of intangible assets		1,369,000	774,000
Depreciation and amortization of office properties and equipment		5,456,000	5,019,000
Amortization of operating lease right-of-use assets		2,865,000	2,720,000
Loss on extinguishment of debt		0	742,000
Provision for (reversal of) credit losses	[1]	4,514,000	(2,561,000)
Gain on securities transactions		(210,000)	(2,015,000)
Change in fair value of equity securities		332,000	1,809,000
Gain on securitizations		0	(2,259,000)
Gain on sale of loans, net		(109,000)	(8,555,000)
Net loss on disposal of office properties and equipment		147,000	61,000
Deferred tax (benefit) expense		(3,487,000)	10,515,000
(Increase) decrease in accrued interest receivable		(942,000)	1,599,000
Decrease (increase) in other assets		2,114,000	(12,891,000)
Increase (decrease) in accrued expenses and other liabilities		24,951,000	(4,941,000)
Income on bank-owned life insurance		(5,501,000)	(4,475,000)
Employee stock ownership plan expense		3,623,000	2,945,000
Stock based compensation		5,787,000	6,743,000
Decrease in deferred compensation obligations under Rabbi Trust		(128,000)	(177,000)
Net cash provided by operating activities		112,211,000	67,481,000
Cash flows from investing activities:
Proceeds from sales of debt securities available for sale		126,772,000	27,249,000
Proceeds from sales of equity securities		0	1,260,000
Proceeds from paydowns/maturities/calls of debt securities available for sale		226,887,000	257,347,000
Proceeds from paydowns/maturities/calls of debt securities held to maturity		27,645,000	29,616,000
Purchases of debt securities available for sale		(142,181,000)	(659,015,000)
Purchases of debt securities held to maturity		(23,298,000)	(175,491,000)
Purchases of equity securities		0	(91,000)
Proceeds from sales of loans held-for-sale		6,187,000	293,005,000
Purchases of loans receivable		0	(74,232,000)
Net increase in loans receivable		(639,970,000)	(208,260,000)
Proceeds from bank-owned life insurance death benefits		776,000	5,000
Proceeds from redemptions of Federal Home Loan Bank stock		60,176,000	7,661,000
Purchases of Federal Home Loan Bank stock		(73,855,000)	(4,793,000)
Proceeds from sales of office properties and equipment		1,009,000	685,000
Additions to office properties and equipment		(4,863,000)	(4,217,000)
Net cash acquired in acquisition		140,769,000	0
Net cash (used in) investing activities		(293,946,000)	(509,271,000)
Cash flows from financing activities:
Net (decrease) increase in deposits		(8,055,000)	443,734,000
Proceeds from long-term borrowings		35,893,000	37,120,000
Payments on long-term borrowings		0	(54,168,000)
Net increase (decrease) in short-term borrowings		255,054,000	(33,427,000)
Increase in advance payments by borrowers for taxes and insurance		6,651,000	3,469,000
Exercise of stock options		(445,000)	(25,000)
Purchase of treasury stock		(71,766,000)	(79,090,000)
Repurchase of shares for taxes		(4,512,000)	(292,000)
Net cash provided by financing activities		212,820,000	317,321,000
Net increase (decrease) in cash and cash equivalents		31,085,000	(124,469,000)
Cash and cash equivalents at beginning of year		70,963,000	422,957,000
Cash and cash equivalents at end of period		102,048,000	298,488,000
Cash paid during the period for:
Interest on deposits and borrowings		23,316,000	29,544,000
Income tax payments, net of (refunds)		13,229,000	13,203,000
Non-cash investing and financing activities:
Transfer of loans receivable to loans held-for-sale		6,078,000	280,304,000
Securitization of loans		0	99,603,000
Non-cash assets acquired:
Debt securities available for sale		79,024,000	0
Equity securities		1,075,000	0
Federal Home Loan Bank stock		906,000	0
Loans receivable		335,501,000	0
Accrued interest receivable		910,000	0
Office properties and equipment, net		7,296,000	0
Goodwill and intangibles		38,274,000	0
Deferred tax asset, net		3,633,000	0
Bank-owned life insurance		13,033,000	0
Other assets		2,723,000	0
Total non-cash assets acquired		482,375,000	0
Liabilities assumed:
Deposits		502,732,000	0
Borrowings		5,762,000	0
Advance payments by borrowers for taxes and insurance		1,341,000	0
Accrued expenses and other liabilities		10,568,000	0
Total liabilities assumed		520,403,000	0
Net non-cash liabilities assumed		(38,028,000)	0
Net cash and cash equivalents acquired in acquisition		$ 140,769,000	$ 0

[1] (1) The Company adopted ASU 2016-13 as of January 1, 2022. Prior year periods have not been restated.