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Loans and Allowance for Credit Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					$ 58,144,000
Unpaid principal balances					64,556,000
Valuation allowance					3,280,000
Impaired Financing Receivable, Average Recorded Investment		$ 86,160,000		$ 85,155,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 0	89,000	$ 0	176,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	854,000	1,400,000	1,600,000	2,600,000
Currently performing impaired loans	$ 32,100,000		$ 32,100,000		35,800,000
Impaired loans with an allowance:
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					35,758,000
Unpaid principal balances					40,305,000
Valuation allowance					3,280,000
Impaired Financing Receivable, Average Recorded Investment		48,494,000		47,261,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans with an allowance: | Commercial real estate – mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					9,998,000
Unpaid principal balances					10,983,000
Valuation allowance					1,235,000
Impaired Financing Receivable, Average Recorded Investment		15,589,000		15,097,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans with an allowance: | Consumer real estate – mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					20,996,000
Unpaid principal balances					23,105,000
Valuation allowance					1,292,000
Impaired Financing Receivable, Average Recorded Investment		22,219,000		21,434,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans with an allowance: | Construction and land development
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					542,000
Unpaid principal balances					654,000
Valuation allowance					33,000
Impaired Financing Receivable, Average Recorded Investment		747,000		692,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans with an allowance: | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					4,074,000
Unpaid principal balances					5,381,000
Valuation allowance					711,000
Impaired Financing Receivable, Average Recorded Investment		9,718,000		9,563,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans with an allowance: | Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					148,000
Unpaid principal balances					182,000
Valuation allowance					9,000
Impaired Financing Receivable, Average Recorded Investment		221,000		475,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans without an allowance:
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					22,386,000
Unpaid principal balances					24,251,000
Valuation allowance					0
Impaired Financing Receivable, Average Recorded Investment		37,666,000		37,894,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		89,000		176,000
Impaired loans without an allowance: | Commercial real estate – mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					8,124,000
Unpaid principal balances					8,891,000
Valuation allowance					0
Impaired Financing Receivable, Average Recorded Investment		13,503,000		13,910,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		89,000		176,000
Impaired loans without an allowance: | Consumer real estate – mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					4,022,000
Unpaid principal balances					4,021,000
Valuation allowance					0
Impaired Financing Receivable, Average Recorded Investment		10,658,000		9,521,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans without an allowance: | Construction and land development
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					19,000
Unpaid principal balances					17,000
Valuation allowance					0
Impaired Financing Receivable, Average Recorded Investment		0		595,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans without an allowance: | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					10,221,000
Unpaid principal balances					11,322,000
Valuation allowance					0
Impaired Financing Receivable, Average Recorded Investment		13,505,000		13,868,000
Impaired Financing Receivable, Interest Income, Cash Basis Method		0		0
Impaired loans without an allowance: | Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment					0
Unpaid principal balances					0
Valuation allowance					$ 0
Impaired Financing Receivable, Average Recorded Investment		0		0
Impaired Financing Receivable, Interest Income, Cash Basis Method		$ 0		$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Topic 310
-SubTopic 10
-Section 50
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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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