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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) Facilities shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Schedule Of Accounting Policies [Line Items]
Full service facilities maintained by bank | Facilities	62
Accrual of interest discontinued description	principal or interest is past due 90 days or more, and the loan is not well secured or in the process of collection, or when serious doubt exists as to the collectability of a loan, the accrual of interest is discontinued.
Commercial loans as a percentage of total loan	57.00%
Residential real estate loans as a percentage of total loan	22.00%
Installment loans as a percentage of total loan	18.00%
Mortgage warehouse loans as a percentage of total loan	3.00%
Period in which loan sold by mortgage company	30 days
Minimum period loan held by mortgage company	90 days
Mortgage warehousing maximum pay off period	30 days
Costs are deferred due to the term	$ 0
Impaired loans charged off	90 days
Status of Non-Accrual of Loan	90 days
Impairment of Loan	30 days
Useful Life for depreciation	2 months
Intangibles, Gross	$ 10,400,000
Uncertain tax positions recognized	50.00%
Shares, non-dilutive | shares	102,138	0	0
Amount available for payment of dividend	$ 26,000,000
Compensation expense	626,000	$ 460,000	$ 608,000
Reclassifications effect on net income	0
Available for Sale Of Securities	$ 600,348,000	509,665,000
Measurement Input, Discount Rate [Member]
Schedule Of Accounting Policies [Line Items]
Factor considered to be significant for fair value measurement	10
Buildings and Improvements [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation	3 years
Buildings and Improvements [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation	40 years
Furniture and Equipment [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation	2 years
Furniture and Equipment [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation	20 years
Accounting Standards Update 2018-02 [Member]
Schedule Of Accounting Policies [Line Items]
Stranded tax effects included in AOCI		$ 766,000
Accounting Standards Update 2017-12 [Member]
Schedule Of Accounting Policies [Line Items]
Net Unrealized Losses	$ 6,300,000
Available for Sale Of Securities	$ 46,000

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