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Loans and Allowance for Credit Losses - Acquired Loans with Credit Deterioration (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 3,094,585,000	$ 2,666,616,000
Less allowance for credit losses	(41,910,000)	(26,911,000)	$ (26,189,000)	$ (19,977,000)
Carrying amount, net of allowance	3,094,585,000	2,666,616,000
Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		4,951,000
Less allowance for credit losses		(365,000)
Carrying amount, net of allowance		4,586,000
Financial Asset Acquired with Credit Deterioration | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		4,951,000
Construction and Land Development | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for credit losses	(1,666,000)	(1,146,000)	(561,000)	(1,202,000)
Construction and Land Development | Financial Asset Acquired with Credit Deterioration | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		256,000
Agricultural | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for credit losses	(1,084,000)	(1,093,000)	(1,246,000)	(1,001,000)
Agricultural | Financial Asset Acquired with Credit Deterioration | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		0
Residential Properties | Real Estate Loan | 1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for credit losses	(2,322,000)	(1,386,000)	(1,504,000)	(886,000)
Residential Properties | Financial Asset Acquired with Credit Deterioration | Real Estate Loan | 1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		371,000
Residential Properties | Financial Asset Acquired with Credit Deterioration | Real Estate Loan | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		2,077,000
Commercial | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for credit losses	(19,660,000)	(11,198,000)	(11,102,000)	(7,918,000)
Commercial | Financial Asset Acquired with Credit Deterioration | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		2,247,000
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for credit losses	(1,526,000)	(1,386,000)	(951,000)	(743,000)
Agricultural Loans | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		0
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for credit losses	(13,485,000)	(9,273,000)	(9,893,000)	(7,425,000)
Commercial and Industrial Loans | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		0
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for credit losses	$ (2,167,000)	(1,429,000)	$ (932,000)	$ (802,000)
Consumer Loans | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount		$ 0

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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