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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 1		$ 47
Collectively evaluated for impairment	16,038		13,957
Modified in a troubled debt restructuring	6,471		5,689
Ending allowance balance	22,510	$ 22,122	19,693	$ 17,849	$ 17,269	$ 16,330
Loans:
Individually evaluated for impairment	1,967		1,238
Collectively evaluated for impairment	2,371,175		2,130,228
Acquired with deteriorated credit quality	1,537,474		1,349,203
Modified in a troubled debt restructuring	17,744		17,303
Total ending loans balance	2,391,463		2,149,848
Acquired with deteriorated credit quality
Ending allowance balance attributable to loans:
Ending allowance balance	0		0
Loans:
Acquired with deteriorated credit quality	577		1,079
Commercial, Industrial, and Agricultural
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		47
Collectively evaluated for impairment	6,343		5,868
Modified in a troubled debt restructuring	237		245
Ending allowance balance	6,580	7,143	6,160	5,356	5,563	5,428
Loans:
Individually evaluated for impairment	1,500		1,187
Collectively evaluated for impairment	847,197		742,738
Acquired with deteriorated credit quality	853,495		749,138
Modified in a troubled debt restructuring	4,798		5,213
Total ending loans balance	853,495		749,138
Commercial, Industrial, and Agricultural | Acquired with deteriorated credit quality
Ending allowance balance attributable to loans:
Ending allowance balance	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Commercial mortgages
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1		0
Collectively evaluated for impairment	5,062		3,563
Modified in a troubled debt restructuring	6,234		5,444
Ending allowance balance	11,297	10,615	9,007	8,094	7,641	6,753
Loans:
Individually evaluated for impairment	467		51
Collectively evaluated for impairment	669,989		586,845
Acquired with deteriorated credit quality	683,979		600,065
Modified in a troubled debt restructuring	12,946		12,090
Total ending loans balance	683,979		600,065
Commercial mortgages | Acquired with deteriorated credit quality
Ending allowance balance attributable to loans:
Ending allowance balance	0		0
Loans:
Acquired with deteriorated credit quality	577		1,079
Residential Real Estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,978		2,033
Modified in a troubled debt restructuring	0		0
Ending allowance balance	1,978	1,900	2,033	2,008	1,670	1,653
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	760,342		713,347
Modified in a troubled debt restructuring	0		0
Total ending loans balance	760,342		713,347
Residential Real Estate | Acquired with deteriorated credit quality
Ending allowance balance attributable to loans:
Ending allowance balance	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Consumer
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	2,323		2,179
Modified in a troubled debt restructuring	0		0
Ending allowance balance	2,323	2,156	2,179	2,088	2,068	2,215
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	85,888		80,193
Modified in a troubled debt restructuring	0		0
Total ending loans balance	85,888		80,193
Consumer | Acquired with deteriorated credit quality
Ending allowance balance attributable to loans:
Ending allowance balance	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Credit Cards
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	107		120
Modified in a troubled debt restructuring	0		0
Ending allowance balance	107	101	120	111	142	93
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	7,434		6,753
Modified in a troubled debt restructuring	0		0
Total ending loans balance	7,434		6,753
Credit Cards | Acquired with deteriorated credit quality
Ending allowance balance attributable to loans:
Ending allowance balance	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Overdrafts
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	225		194
Modified in a troubled debt restructuring	0		0
Ending allowance balance	225	$ 207	194	$ 192	$ 185	$ 188
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	325		352
Modified in a troubled debt restructuring	0		0
Total ending loans balance	325		352
Overdrafts | Acquired with deteriorated credit quality
Ending allowance balance attributable to loans:
Ending allowance balance	0		0
Loans:
Acquired with deteriorated credit quality	$ 0		$ 0

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Allowance for loan losses ending allowance balance attributable to loans.

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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. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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