Business Combinations - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)	Feb. 14, 2022	Feb. 22, 2021	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Assets
Goodwill			$ 140,412,000	$ 111,853,000
Delta Bancshare Company
Assets
Cash and due from banks	$ 82,473,000
Investment securities	182,123,000
Loans	418,509,000
Allowance for loan losses	(863,000)
Premises and equipment	9,030,000
Goodwill	28,558,000
Other assets	7,774,000
Total assets acquired	750,063,000
Liabilities and stockholders' equity
Deposits	560,378,000
Securities sold under agreements to repurchase	35,523,000
FHLB advances	45,075,000
Lease liability	717,000
Other liabilities	1,048,000
Total liabilities assumed	642,741,000
Net assets acquired	107,322,000
Consideration paid
Consideration payable in cash	15,150,000
Common stock	92,172,000
Total consideration paid	107,322,000
Delta Bancshare Company | Core Deposit Intangibles
Assets
Intangible assets	5,920,000
Delta Bancshare Company | Bank Owned Life Insurance
Assets
Intangible assets	15,822,000
Delta Bancshare Company | Right of Use Asset
Assets
Intangible assets	717,000
Delta Bancshare Company | Acquired Book Value
Assets
Cash and due from banks	82,473,000
Investment securities	184,959,000
Loans	426,433,000
Allowance for loan losses	(5,388,000)
Premises and equipment	5,522,000
Goodwill	14,000
Other assets	9,061,000
Total assets acquired	718,896,000
Liabilities and stockholders' equity
Deposits	558,619,000
Securities sold under agreements to repurchase	35,523,000
FHLB advances	45,000,000
Lease liability	0
Other liabilities	2,209,000
Total liabilities assumed	641,351,000
Net assets acquired	77,545,000
Delta Bancshare Company | Acquired Book Value | Core Deposit Intangibles
Assets
Intangible assets	0
Delta Bancshare Company | Acquired Book Value | Bank Owned Life Insurance
Assets
Intangible assets	15,822,000
Delta Bancshare Company | Acquired Book Value | Right of Use Asset
Assets
Intangible assets	0
Delta Bancshare Company | Fair Value Adjustments
Assets
Cash and due from banks	0
Investment securities	(2,836,000)
Loans	(7,924,000)
Allowance for loan losses	4,525,000
Premises and equipment	3,508,000
Goodwill	28,544,000
Other assets	(1,287,000)
Total assets acquired	31,167,000
Liabilities and stockholders' equity
Deposits	1,759,000
Securities sold under agreements to repurchase	0
FHLB advances	75,000
Lease liability	717,000
Other liabilities	(1,161,000)
Total liabilities assumed	1,390,000
Net assets acquired	29,777,000
Delta Bancshare Company | Fair Value Adjustments | Core Deposit Intangibles
Assets
Intangible assets	5,920,000
Delta Bancshare Company | Fair Value Adjustments | Bank Owned Life Insurance
Assets
Intangible assets	0
Delta Bancshare Company | Fair Value Adjustments | Right of Use Asset
Assets
Intangible assets	$ 717,000
LINCO Bancshares, Inc.
Assets
Cash and due from banks		$ 130,561,000
Investment securities		119,498,000
Loans		828,976,000
Allowance for loan losses		(2,073,000)
Other real estate owned		9,350,000
Premises and equipment		29,800,000
Goodwill		5,449,000	$ 5,400,000		$ 8,900,000
Other assets		46,196,000
Total assets acquired		1,170,699,000
Liabilities and stockholders' equity
Deposits		990,410,000
Securities sold under agreements to repurchase		0
FHLB advances		27,916,000
Other borrowings		0
Lease liability		794,000
Other liabilities		3,888,000
Total liabilities assumed		1,023,008,000
Net assets acquired		147,691,000
Consideration paid
Consideration payable in cash		103,500,000
Common stock		44,191,000
Total consideration paid		147,691,000
LINCO Bancshares, Inc. | Core Deposit Intangibles
Assets
Intangible assets		2,148,000
LINCO Bancshares, Inc. | Right of Use Asset
Assets
Intangible assets		794,000
LINCO Bancshares, Inc. | Acquired Book Value
Assets
Cash and due from banks		130,561,000
Investment securities		119,234,000
Loans		838,377,000
Allowance for loan losses		(8,656,000)
Other real estate owned		8,435,000
Premises and equipment		23,440,000
Goodwill		20,503,000
Other assets		43,697,000
Total assets acquired		1,175,714,000
Liabilities and stockholders' equity
Deposits		988,329,000
Securities sold under agreements to repurchase		0
FHLB advances		26,941,000
Other borrowings		0
Lease liability		0
Other liabilities		4,498,000
Total liabilities assumed		1,019,768,000
Net assets acquired		155,946,000
LINCO Bancshares, Inc. | Acquired Book Value | Core Deposit Intangibles
Assets
Intangible assets		123,000
LINCO Bancshares, Inc. | Acquired Book Value | Right of Use Asset
Assets
Intangible assets		0
LINCO Bancshares, Inc. | Fair Value Adjustments
Assets
Cash and due from banks		0
Investment securities		264,000
Loans		(9,401,000)
Allowance for loan losses		6,583,000
Other real estate owned		915,000
Premises and equipment		6,360,000
Goodwill		(15,054,000)
Other assets		2,499,000
Total assets acquired		(5,015,000)
Liabilities and stockholders' equity
Deposits		2,081,000
Securities sold under agreements to repurchase		0
FHLB advances		975,000
Other borrowings		0
Lease liability		794,000
Other liabilities		(610,000)
Total liabilities assumed		3,240,000
Net assets acquired		(8,255,000)
LINCO Bancshares, Inc. | Fair Value Adjustments | Core Deposit Intangibles
Assets
Intangible assets		2,025,000
LINCO Bancshares, Inc. | Fair Value Adjustments | Right of Use Asset
Assets
Intangible assets		$ 794,000