Consolidated Statements of Cash Flows (unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 18,034,000	$ 17,050,000
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sales of mortgage loans	(1,331,000)	(742,000)
Net gains on sales of securities	(64,000)	(170,000)
Provision for loan losses	1,175,000	200,000
Deferred income taxes	(3,143,000)	(1,825,000)
Net depreciation and amortization	2,498,000	2,486,000
Decrease (increase) in accrued interest receivable	405,000	(1,065,000)
Increase in other assets	(3,877,000)	(10,430,000)
Increase in other liabilities	3,484,000	1,982,000
Net cash provided by operating activities	17,181,000	7,486,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(8,000)	(8,000)
Proceeds from redemptions of Federal Home Loan Bank of Boston stock	10,276,000
Purchase of Federal Home Loan Bank of Boston stock	(2,617,000)
Proceeds from calls/maturities of securities available-for-sale	206,025,000	163,809,000
Proceeds from sales of securities available-for-sale	2,376,000	42,716,000
Purchase of securities available-for-sale	(328,565,000)	(168,889,000)
Proceeds from calls/maturities of securities held-to-maturity	318,815,000	310,694,000
Proceeds from sales of securities held-to-maturity	192,000	0
Purchase of securities held-to-maturity	(441,756,000)	(443,705,000)
Net increase in loans	(182,901,000)	(356,915,000)
Proceeds from sales of portfolio loans	74,668,000	48,041,000
Capital expenditures	(1,408,000)	(2,063,000)
Net cash used in investing activities	(344,903,000)	(406,320,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in time deposits	(18,795,000)	23,275,000
Net increase in demand, savings, money market and NOW deposits	404,848,000	148,706,000
Cash dividends	(1,650,000)	(1,650,000)
Net increase (decrease) in securities sold under agreements to repurchase	16,470,000	(590,000)
Net (decrease) increase in other borrowed funds	(75,000,000)	37,000,000
Net cash provided by financing activities	325,873,000	206,741,000
Net decrease in cash and cash equivalents	(1,849,000)	(192,093,000)
Cash and cash equivalents at beginning of period	220,724,000	305,357,000
Cash and cash equivalents at end of period	218,875,000	113,264,000
Cash paid during the period for:
Interest	16,806,000	14,735,000
Income taxes	2,730,000	3,780,000
Change in unrealized losses on securities available-for-sale, net of taxes	(148,000)	(104,000)
Change in unrealized losses on securities transferred to held-to-maturity, net of taxes	2,274,000	2,697,000
Pension liability adjustment, net of taxes	727,000	639,000
Change in due to (from) to broker	$ 1,847,000	$ 4,430,000