Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 51,558	$ 43,367
Federal funds sold and interest-bearing deposits in other banks	61,706	261,990
Total cash and cash equivalents	113,264	305,357
Short-term investments	2,139	2,131
Securities available-for-sale, amortized cost $410,206 and $448,210, respectively	410,214	448,390
Securities held-to-maturity, fair value $1,565,261 and $1,413,603, respectively	1,543,775	1,406,792
Federal Home Loan Bank of Boston stock, at cost	29,698	24,916
Loans, net:
Commercial and industrial	378,154	149,732
Municipal	87,016	41,850
Construction and land development	27,308	22,744
Commercial real estate	701,523	696,272
Residential real estate	264,105	257,305
Home equity	172,091	151,275
Consumer and other	10,633	12,188
Total loans, net	1,640,830	1,331,366
Less: allowance for loan losses	22,330	22,318
Net loans	1,618,500	1,309,048
Bank premises and equipment	24,214	24,182
Accrued interest receivable	7,306	6,241
Goodwill	2,714	2,714
Other assets	104,583	94,265
Total assets	3,856,407	3,624,036
Deposits:
Demand deposits	534,870	484,928
Savings and NOW deposits	1,071,773	978,619
Money Market Accounts	896,509	890,899
Time deposits	406,420	383,145
Total deposits	2,909,572	2,737,591
Securities sold under agreements to repurchase	211,770	212,360
Other borrowed funds	432,500	395,500
Subordinated debentures	36,083	36,083
Due to broker	4,430
Other liabilities	50,920	50,002
Total liabilities	$ 3,645,275	$ 3,431,536
Stockholders' Equity
Preferred stock - $1.00 par value; 100,000 shares authorized; no shares issued and outstanding
Additional paid-in capital	$ 12,292	$ 12,292
Retained earnings	215,811	200,411
Stockholders' equity before adjustment of accumulated other comprehensive income (loss)	233,671	218,271
Unrealized (losses) gains on securities available-for-sale, net of taxes	(27)	77
Unrealized losses on securities transferred to held-to-maturity, net of taxes	(7,782)	(10,479)
Pension liability, net of taxes	(14,730)	(15,369)
Total accumulated other comprehensive loss, net of taxes	(22,539)	(25,771)
Total stockholders' equity	211,132	192,500
Total liabilities and stockholders' equity	3,856,407	3,624,036
Class A Common Stock [Member]
Stockholders' Equity
Common stock value	3,601	3,601
Total stockholders' equity	3,601	3,601
Class B Common Stock [Member]
Stockholders' Equity
Common stock value	1,967	1,967
Total stockholders' equity	$ 1,967	$ 1,967