Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents	$ 173,740,000	$ 38,968,000
Investment securities available-for-sale, at fair value	748,032,000	697,544,000
Loans:
Loans	3,152,461,000	3,188,249,000
Allowance for credit losses	(34,051,000)	(29,289,000)
Total	3,118,410,000	3,158,960,000
Restricted stock, at cost	29,543,000	30,899,000
Bank premises and equipment, net	39,463,000	40,017,000
Right-of-use asset - operating leases	13,675,000	14,343,000
Bank-owned life insurance	84,251,000	83,119,000
Pension plan assets, net	18,407,000	18,275,000
Deferred income tax benefit	3,856,000	317,000
Other assets	18,951,000	15,401,000
Total assets	4,248,328,000	4,097,843,000
Deposits:
Checking	1,152,945,000	911,978,000
Savings, NOW and money market	1,701,266,000	1,720,599,000
Time, $100,000 and over	213,262,000	242,359,000
Time, other	255,449,000	269,080,000
Total	3,322,922,000	3,144,016,000
Short-term borrowings	60,019,000	190,710,000
Long-term debt	439,972,000	337,472,000
Operating lease liability	14,561,000	15,220,000
Accrued expenses and other liabilities	21,116,000	21,317,000
Total liabilities	3,858,590,000	3,708,735,000
Stockholders' Equity:
Common stock, par value $0.10 per share: Authorized, 80,000,000 shares; Issued and outstanding, 23,848,626 and 23,934,632 shares	2,385,000	2,393,000
Surplus	106,047,000	111,744,000
Retained earnings	283,379,000	274,376,000
Total	391,811,000	388,513,000
Accumulated other comprehensive income (loss), net of tax	(2,073,000)	595,000
Total	389,738,000	389,108,000
Total	4,248,328,000	4,097,843,000
Commercial And Industrial [Member]
Loans:
Loans	104,673,000	103,879,000
Allowance for credit losses	(1,593,000)	(1,493,000)
SBA Paycheck Protection Program [Member]
Loans:
Loans	165,704,000
Allowance for credit losses	(249,000)
Commercial Mortgages [Member]
Loans:
Loans	1,351,542,000	1,401,289,000
Consumer And Other [Member]
Loans:
Loans	1,416,000	2,431,000
Allowance for credit losses	(5,000)	(13,000)
Closed-end [Member] | Residential Mortgages [Member]
Loans:
Loans	1,470,181,000	1,621,419,000
Allowance for credit losses	(17,384,000)	(15,698,000)
Revolving Home Equity [Member] | Residential Mortgages [Member]
Loans:
Loans	58,945,000	59,231,000
Allowance for credit losses	$ (482,000)	$ (515,000)