Business Combinations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Sep. 01, 2021	May 03, 2021	Mar. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	$ 1.00			$ 1	$ 1
Goodwill				$ 91,565	$ 74,135	$ 65,614
Merger-related costs				3,701	4,565
Sevier County Bancshares Inc [Member]
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	0
Sevier County Bancshares Inc [Member]
Business Acquisition [Line Items]
Cash to be paid upon conversion (in dollars per share)	$ 10.17
Common shares to be converted (in shares)	0.4116
Number of shares issued (in shares)	1,692,168
Cash consideration paid	$ 9,600			9,568
Pro forma, revenue of acquiree since acquisition date, actual				3,526
Pro forma information, earnings (loss) since acquisition date, actual				76
Pro forma revenue				147,406	127,496
Pro forma net income (loss)				39,707	23,994
Assets acquired	484,880			477,500
Liabilities assumed	443,099			442,848
Goodwill	17,200			17,171
Merger-related costs				3,500
Sevier County Bancshares Inc [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 1,600
Useful life	10 years
Sevier County Bancshares Inc [Member] | Sevier County Bancshares Inc [Member]
Business Acquisition [Line Items]
Threshold number of shares to be held by a shareholder to receive the per share stock consideration	20,000
Fountain [Member]
Business Acquisition [Line Items]
Cash consideration paid		$ 14,000		59,794
Repayment of indebtedness		45,800
Future cash payments of performance-based earnout		6,000
Pro forma, revenue of acquiree since acquisition date, actual				4,576
Pro forma information, earnings (loss) since acquisition date, actual				1,271
Pro forma revenue				139,131	129,901
Pro forma net income (loss)				34,767	$ 25,658
Assets acquired		54,114		57,848
Liabilities assumed		683		454
Goodwill		2,400		2,400
Merger-related costs				172
Fountain [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired		$ 2,700
Useful life		8 years
Progressive Financial Group Inc. [Member]
Business Acquisition [Line Items]
Cash to be paid upon conversion (in dollars per share)			$ 474.82
Common shares to be converted (in shares)			62.3808
Number of shares issued (in shares)			1,292,578
Cash consideration paid			$ 9,800	9,838
Assets acquired			301,041	298,322
Liabilities assumed			272,052	272,781
Goodwill			8,800	$ 8,844
Progressive Financial Group Inc. [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Intangible assets acquired			$ 1,400
Useful life			10 years
Progressive Financial Group Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired			$ 1,100
Useful life			10 years
Progressive Financial Group Inc. [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets acquired			$ 63
Useful life			5 years