CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
INTEREST AND DIVIDEND INCOME:
Loans, including related fees	$ 84,022	$ 87,530	$ 91,242
Securities:
Taxable	15,815	17,015	16,157
Tax-exempt	7,194	7,084	7,046
Other	1,645	1,729	1,776
TOTAL INTEREST AND DIVIDEND INCOME	108,676	113,358	116,221
INTEREST EXPENSE:
Deposits	3,934	4,624	5,886
Short-term borrowings	70	99	78
Other borrowings	165	803	2,997
TOTAL INTEREST EXPENSE	4,169	5,526	8,961
NET INTEREST INCOME	104,507	107,832	107,260
Provision for loan losses	4,700	5,072	7,860
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	99,807	102,760	99,400
NON-INTEREST INCOME:
Trust and financial services	5,586	5,860	6,035
Service charges and fees on deposit accounts	10,145	10,772	10,162
Other service charges and fees	11,798	11,697	11,081
Securities gain (loss), net	17	(3)	423
Insurance commissions	6,945	7,646	7,750
Gain on sale of mortgage loans	1,998	1,849	3,052
Other	2,690	2,964	1,952
TOTAL NON-INTEREST INCOME	39,179	40,785	40,455
Labor and Related Expense	60,109	55,936	55,097
NON-INTEREST EXPENSES:
Occupancy expense	6,978	7,218	6,102
Equipment expense	6,991	7,269	6,348
Federal Deposit Insurance	1,769	1,931	2,052
Other	22,551	23,230	24,955
TOTAL NON-INTEREST EXPENSE	98,398	95,584	94,554
INCOME BEFORE INCOME TAXES	40,588	47,961	45,301
Provision for income taxes	10,392	14,189	13,767
NET INCOME	30,196	33,772	31,534
OTHER COMPREHENSIVE INCOME
Change in unrealized gains/losses on securities, net of reclassifications and taxes	(1,225)	13,913	(17,066)
Change in funded status of post-retirement benefits, net of taxes	6,353	$ (14,473)	$ 10,569
COMPREHENSIVE INCOME	$ 35,324
EARNINGS PER SHARE:
BASIC AND DILUTED (in dollars per share)	$ 2.35	$ 2.55	$ 2.37
Weighted average number of shares outstanding (in shares)	12,836	13,226	13,310