Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Loans, including fees		$ 33,844,000	$ 35,058,000	$ 101,692,000	$ 100,075,000
Federal funds sold and interest bearing due from banks		54,000	566,000	673,000	2,129,000
Mortgage loans held for sale		173,000	41,000	359,000	121,000
Securities available for sale:
Taxable		2,029,000	2,239,000	6,631,000	7,353,000
Tax-exempt		44,000	105,000	177,000	382,000
Total interest income		36,144,000	38,009,000	109,532,000	110,060,000
Interest expense:
Deposits		2,107,000	5,316,000	8,676,000	16,034,000
Securities sold under agreements to repurchase		7,000	26,000	31,000	79,000
Federal funds purchased and other short-term borrowing		2,000	52,000	33,000	176,000
Federal Home Loan Bank advances		333,000	509,000	1,123,000	1,154,000
Subordinated debentures		0	0	0	26,000
Total interest expense		2,449,000	5,903,000	9,863,000	17,469,000
Net interest income		33,695,000	32,106,000	99,669,000	92,591,000
Provision for credit losses		4,418,000	400,000	15,518,000	1,000,000
Net interest income after provision		29,277,000	31,706,000	84,151,000	91,591,000
Non-interest income:
Non-interest income		5,657,000	5,738,000	17,601,000	16,839,000
Mortgage banking income	[1]	1,979,000	794,000	4,447,000	2,004,000
Bank owned life insurance	[1]	172,000	487,000	527,000	849,000
Total non-interest income		13,043,000	13,209,000	38,201,000	36,441,000
Non-interest expenses:
Compensation		13,300,000	12,330,000	37,296,000	36,846,000
Employee benefits		2,853,000	2,819,000	8,891,000	8,182,000
Net occupancy and equipment		2,235,000	2,189,000	6,205,000	6,005,000
Technology and communication		2,265,000	1,841,000	6,225,000	5,462,000
Debit and credit card processing		649,000	662,000	1,908,000	1,880,000
Marketing and business development		523,000	732,000	1,548,000	2,260,000
Postage, printing and supplies		472,000	402,000	1,355,000	1,218,000
Legal and professional		544,000	524,000	1,795,000	2,581,000
FDIC insurance		435,000	0	894,000	486,000
Amortization of investments in tax credit partnerships		52,000	137,000	141,000	241,000
Capital and deposit based taxes		1,076,000	993,000	3,331,000	2,864,000
Credit loss expense for off-balance sheet exposures		550,000	0	2,400,000	0
Other		1,242,000	1,269,000	3,041,000	3,937,000
Total non-interest expenses		26,196,000	23,898,000	75,030,000	71,962,000
Income before income tax expense		16,124,000	21,017,000	47,322,000	56,070,000
Income tax expense		1,591,000	3,783,000	6,189,000	6,652,000
Net income		$ 14,533,000	$ 17,234,000	$ 41,133,000	$ 49,418,000
Net income per share, basic (in dollars per share)		$ 0.64	$ 0.76	$ 1.82	$ 2.18
Net income per share, diluted (in dollars per share)		$ 0.64	$ 0.76	$ 1.81	$ 2.16
Weighted average outstanding shares:
Basic (in shares)		22,582	22,550	22,553	22,633
Diluted (in shares)		22,802	22,810	22,759	22,901
Fiduciary and Trust [Member]
Non-interest income:
Non-interest income		$ 5,657,000	$ 5,738,000	$ 17,601,000	$ 16,839,000
Deposit Account [Member]
Non-interest income:
Non-interest income		998,000	1,356,000	3,081,000	3,793,000
Credit and Debit Card [Member]
Non-interest income:
Non-interest income		2,218,000	2,102,000	6,261,000	6,014,000
Treasury Management [Member]
Non-interest income:
Non-interest income		1,368,000	1,264,000	3,901,000	3,623,000
Investment Advisory, Management and Administrative Service [Member]
Non-interest income:
Non-interest income		431,000	400,000	1,288,000	1,120,000
Product and Service, Other [Member]
Non-interest income:
Non-interest income		$ 220,000	$ 1,068,000	$ 1,095,000	$ 2,199,000

[1] Outside of the scope of ASC 606.