Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net Income		$ 29,319,000	$ 26,209,000	$ 17,701,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses		2,945,000	4,200,000	1,390,000
Depreciation		3,316,000	3,204,000	2,815,000
Amortization of intangibles		1,180,000	1,398,000	1,430,000
Net amortization of security premiums		636,000	782,000	755,000
Amortization of operating lease right of use assets		1,698,000	1,670,000	1,678,000
Operating right of use asset abandonment		1,348,000
Amortization of finance lease right of use asset		180,000	180,000	150,000
Gain on sales of investment securities		(79,000)	(467,000)	(1,878,000)
Earnings on cash surrender value of life insurance		(358,000)	(301,000)	(331,000)
Mortgage loans originated for sale		(316,849,000)	(356,158,000)	(163,228,000)
Proceeds from sales of mortgage loans originated for sale		341,155,000	348,756,000	160,279,000
Gain on sale of mortgage loans		(10,314,000)	(9,682,000)	(3,771,000)
SBA loans originated for sale		(10,890,000)	(6,487,000)	(13,792,000)
Proceeds from sales of SBA loans originated for sale		11,859,000	6,929,000	14,622,000
Gain on sale of SBA loans		(969,000)	(442,000)	(831,000)
(Gain) loss on write-down/disposal of property, plant, and equipment		(105,000)	242,000	168,000
(Gain) loss on sale or write-down of foreclosed assets		(25,000)	333,000	(15,000)
Restricted stock compensation expense		696,000	414,000	346,000
Deferred income tax expense (benefit)		484,000	(1,367,000)	665,000
Decrease (increase) in accrued interest receivable		3,562,000	(5,007,000)	280,000
Increase in other assets		(4,321,000)	(1,971,000)	(8,193,000)
Decrease in accrued interest payable		(655,000)	(201,000)	(54,000)
Net change in operating lease liability		(1,781,000)	(1,714,000)	(1,782,000)
Increase (decrease) in other liabilities		13,867,000	3,549,000	(573,000)
Net Cash Provided By Operating Activities		65,899,000	14,069,000	7,831,000
Investing Activities:
Proceeds from the sale of available-for-sale securities		5,178,000	101,739,000	154,307,000
Proceeds from the maturity or call of available-for-sale securities		2,856,000	8,538,000	13,659,000
Purchases of available-for-sale securities		(65,192,000)	(78,542,000)	(20,406,000)
Proceeds from the maturity or call of held-to-maturity securities		42,416,000	107,583,000	23,160,000
Purchases of held-to-maturity securities		(243,987,000)	(100,029,000)	(58,848,000)
Net cash received from acquisition		315,287,000
Redemptions (purchases) of restricted investment in bank stocks		669,000	(2,692,000)	1,744,000
Net decrease (increase) in loans and leases		115,367,000	(623,153,000)	(139,430,000)
Proceeds from bank owned life insurance				140,000
Purchases of bank premises and equipment		(3,497,000)	(3,685,000)	(3,885,000)
Proceeds from sale of bank premises and equipment		62,000	65,000	1,268,000
Proceeds from sale of foreclosed assets		212,000	1,264,000	1,306,000
Net Cash Provided By (Used In) Investing Activities		169,371,000	(588,912,000)	(26,985,000)
Financing Activities:
Net increase in deposits		446,045,000	562,186,000	186,368,000
Net (decrease) increase in short-term borrowings		(125,617,000)	125,617,000	(43,100,000)
Proceeds from long-term debt borrowings			70,000,000	13,500,000
Common stock dividends paid		(8,872,000)	(6,504,000)	(6,688,000)
Proceeds from Employee Stock Purchase Plan stock issuance		172,000	155,000	134,000
Proceeds from Director Stock Purchase Plan stock issuance		135,000	156,000	135,000
Treasury stock purchased		(128,000)	(1,795,000)
Net change in finance lease liability		(87,000)	(83,000)	(46,000)
Long-term debt repayment		(258,000)	(27,705,000)	(32,184,000)
Subordinated debt redemption		(6,870,000)	(9,640,000)
Subordinated debt issuance			27,150,000
Net Cash Provided By Financing Activities		374,758,000	739,537,000	118,119,000
Net increase in cash and cash equivalents		610,028,000	164,694,000	98,965,000
Cash and cash equivalents, beginning of year		303,724,000	139,030,000	40,065,000
Cash and cash equivalents, end of year		913,752,000	303,724,000	139,030,000
Supplemental Disclosures of Cash Flow Information:
Interest paid		14,970,000	19,928,000	25,218,000
Income taxes paid		6,950,000	7,740,000	3,770,000
Supplemental Noncash Disclosures:
Recognition of operating lease right-of-use assets		1,944,000	385,000	13,120,000
Recognition of operating lease liabilities		1,944,000	370,000	14,326,000
Recognition of finance lease right-of-use asset				3,597,000
Recognition of finance lease liability				3,597,000
Loan transfers to foreclosed assets held for sale		53,000	1,535,000	470,000
Debt securities transferred from held-to-maturity to available-for-sale				$ 67,096,000
Dividends declared and not paid before year-end			$ 421,000
Riverview Financial Corporation [Member]
Supplemental Noncash Disclosures:
Common stock issued to Riverview shareholders		4,520,000
Assets Acquired:
Securities	[1]	226,000
Loans	[1]	837,505,000
Restricted stock	[1]	2,209,000
Property and equipment	[1]	11,819,000
Deferred income taxes	[1]	7,110,000
Accrued interest receivable	[1]	1,919,000
Core deposit and other intangible assets	[1]	6,256,000
Cash surrender value of life insurance	[1]	32,120,000
Other assets	[1]	6,683,000
Assets acquired	[1]	905,847,000
Liabilities Assumed:
Deposits	[1]	1,081,647,000
Borrowings	[1]	42,808,000
Accrued interest payable	[1]	439,000
Other liabilities	[1]	5,043,000
Liabilities assumed	[1]	1,129,937,000
Follow-on Public Offering [Member]
Financing Activities:
Proceeds from follow-on common stock public offering		$ 70,238,000

[1] This disclosure includes the impact of the acquisition of Riverview Financial Corporation on November 30, 2021.  See Note 4, Acquisition of Riverview Financial Corporation to the consolidated financial statements for more information.