Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 19,039	$ 16,693	$ 13,574
Adjustments to reconcile net income to net cash provided by operating activities:
Mortgage loans originated for sale	(20,149)	(22,664)
Proceeds from mortgage loans sold	14,457	19,697
Gain on sale of mortgage loans held for sale	(297)	(422)
Gain on sale of loans		(238)
Gain on sale of fixed assets	(1)		(7)
Net gains on sales of securities	(1,843)	(1,940)	(1,851)
Provision for loan losses	4,150	4,550	5,575
Deferred tax benefit	(2,104)	(953)	(1,546)
Net depreciation and amortization	6,445	5,558	4,955
Decrease (increase) in accrued interest receivable	211	579	(795)
Decrease in prepaid FDIC assessments	1,562	1,794	2,629
(Gain) loss on sales of other real estate owned	(1)	8	(127)
Write down of other real estate owned		117
Increase in other assets	(3,113)	(4,456)	(1,417)
Increase (decrease) in other liabilities	1,070	503	(849)
Net cash provided by operating activities	19,426	18,826	20,141
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of short-term investments	38,397	121,106	131,762
Purchase of short-term investments	(37,413)	(25,539)	(227,162)
Proceeds from redemption of Federal Home Loan Bank of Boston stock	385
Proceeds from calls/maturities of securities available-for-sale	532,734	722,403	610,975
Proceeds from sales of securities available-for-sale	294,881	75,615	41,251
Purchase of securities available-for-sale	(998,955)	(1,140,194)	(914,944)
Proceeds from calls/maturities of securities held-to-maturity	88,628	119,315	154,445
Purchase of securities held-to-maturity	(185,346)	(68,863)	(167,442)
Proceeds from sale of loans		4,000
Net increase in loans	(123,183)	(82,793)	(33,315)
Proceeds from sales of other real estate owned	1,584	802	555
Proceeds from sales of fixed assets	1		13
Capital expenditures	(4,300)	(2,692)	(2,281)
Net cash used in investing activities	(392,587)	(276,840)	(406,143)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in time deposit accounts	(13,518)	16,241	124,622
Net increase in demand, savings, money market and NOW deposits	334,007	206,320	75,414
Net proceeds from exercise of stock options	304	52	150
Cash dividends	(2,186)	(2,180)	(2,173)
Net increase (decrease) in securities sold under agreements to repurchase	48,070	34,770	(10,195)
Net (decrease) increase in other borrowed funds	(48,999)	22,025	(11,906)
Net cash provided by financing activities	317,678	277,228	175,912
Net (decrease) increase in cash and cash equivalents	(55,483)	19,214	(210,090)
Cash and cash equivalents at beginning of year	207,766	188,552	398,642
Cash and cash equivalents at end of year	152,283	207,766	188,552
Cash paid during the year for:
Interest	19,597	22,799	24,930
Income taxes	3,348	3,109	3,580
Change in unrealized gains on securities available-for-sale, net of taxes	4,011	4,726	(536)
Pension liability adjustment, net of taxes	(1,839)	(3,667)	1,259
Transfer of loans to other real estate owned	$ 400	$ 2,110	$ 428