Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 14,919,000	$ 11,784,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred loan fees and costs, premiums and discounts	314,000	392,000
Net amortization of premiums and discounts on securities	309,000	373,000
Net amortization on mortgage servicing rights	(21,000)	21,000
Amortization of debt issuance costs	0	13,000
Depreciation and amortization of office properties and equipment	1,057,000	897,000
Provision for loan losses	436,000	2,000,000
Gain on securities transactions	(126,000)	(116,000)
Change in fair value of equity securities	(176,000)	0
(Gain) on sales of loans receivable	(132,000)	0
Loss on real estate owned	1,000	0
Deferred tax expense	148,000	192,000
Increase in accrued interest receivable	(1,198,000)	(699,000)
Increase (decrease) in other assets	6,197,000	(4,594,000)
(Increase) decrease in accrued expenses and other liabilities	(3,553,000)	898,000
Income on bank-owned life insurance	(1,320,000)	(1,064,000)
Employee stock ownership plan expense	868,000	0
Increase in deferred compensation obligations under Rabbi Trust	30,000	0
Net cash provided by operating activities	17,753,000	10,097,000
Cash flows from investing activities:
Proceeds from sales of equity securities	764,000	0
Proceeds from paydowns/maturities/calls of debt securities available for sale	25,942,000	21,295,000
Proceeds from paydowns/maturities/calls on debt securities held to maturity	2,925,000	1,951,000
Purchases of debt securities available for sale	(65,487,000)	(174,669,000)
Purchases of debt securities held to maturity	(28,426,000)	(16,506,000)
Proceeds from sales of loans held-for sale	8,081,000	0
Proceeds from sales of loans receivable	9,311,000	0
Purchases of loan receivable	(2,313,000)	(4,715,000)
Net increase in loans receivable	(45,415,000)	(77,126,000)
Proceeds from redemptions of Federal Home Loan Bank stock	19,017,000	27,766,000
Purchases of Federal Home Loan Bank stock	(14,942,000)	(12,483,000)
Additions to office properties and equipment	(7,298,000)	(1,984,000)
Proceeds from sales of real estate owned	91,000	0
Net cash used in investing activities	(97,750,000)	(236,471,000)
Cash flows from financing activities:
Net increase in deposits	192,755,000	1,131,938,000
Proceeds from long-term borrowings	53,455,000	26,360,000
Payments on long-term borrowings	(60,000,000)	(90,000,000)
Net decrease in short-term borrowings	(84,000,000)	(276,000,000)
Increase in advance payments by borrowers for taxes and insurance	727,000	2,959,000
Net cash provided by financing activities	102,937,000	795,257,000
Net increase in cash and cash equivalents	22,940,000	568,883,000
Cash and cash equivalents at beginning of year	42,201,000	65,498,000
Cash and cash equivalents at end of period	65,141,000	634,381,000
Cash paid during the period for:
Interest on deposits and borrowings	20,272,000	14,555,000
Income tax payments	100,000	5,910,000
Non-cash investing and financing activities:
Securitization of loans	$ 6,061,000	$ 0