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Fair Value Measurements - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains (losses) related to assets or liabilities measured on a recurring basis using significant unobservable inputs	$ 0	$ 0
Impaired loans not covered under loss-share agreements	22,621,000	20,394,000
Specific reserve included in allowance for loan losses	49,026,000	46,211,000
Net gain (loss) resulting from fair value changes of these mortgage loans	4,892,000	1,594,000	$ (4,851,000)
Impaired Loans, Not Covered
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific reserve included in allowance for loan losses	$ 935,000	$ 1,029,000

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Impaired loans not covered under loss-share agreements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of realized and unrealized gain (loss) included in earnings, which have arisen from the use of significant unobservable inputs (level 3) to measure fair value of assets, liabilities, and financial instruments classified in shareholders' equity.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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