Business Combinations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended		10 Months Ended	14 Months Ended
	Sep. 01, 2021	May 03, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	$ 1.00		$ 1		$ 1		$ 1	$ 1	$ 1
Goodwill			$ 91,565		$ 91,565		$ 91,565	$ 91,565	$ 91,565	$ 74,135
Merger-related costs			81	$ 372	$ 520	$ 475
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				1,692,168
Cash	$ 9,600						9,568
Assets acquired	484,880		477,500		$ 477,500		477,500	477,500
Liabilities assumed	443,099		442,848		442,848		442,848	442,848
Goodwill	17,200		17,171		17,171		17,171	17,171
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		$ 14,000						59,794
Repayment of indebtedness		45,800
Future cash payments of performance-based earnout		6,000
Assets acquired		54,114	57,848		57,848		57,848	57,848
Liabilities assumed		683	454		454		454	454
Goodwill		2,400	$ 2,400		$ 2,400		$ 2,400	$ 2,400
Fountain [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired		$ 2,700
Useful life		8 years