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Loans and Allowance for Loan Losses - Activity in ALL by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				$ 51,666				$ 48,693	$ 51,666	$ 48,693
Charge- offs									(5,003)	(6,965)
Recoveries									924	1,426
Net charge- offs									(4,079)	(5,539)
Provisions charged to operations	$ 1,516	$ 747	$ 1,225	314	$ 3,323	$ 3,276	$ 1,841	72	3,802	8,512	$ 11,519
Balance at end of period	51,389				51,666				51,389	51,666	48,693
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				6,195				5,602	6,195	5,602
Charge- offs									(282)	(74)
Recoveries									17	6
Net charge- offs									(265)	(68)
Provisions charged to operations									398	661
Balance at end of period	6,328				6,195				6,328	6,195	5,602
Real Estate [Member] | Non-residential Real Estate Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				10,519				10,793	10,519	10,793
Charge- offs									(93)	(47)
Recoveries									41	16
Net charge- offs									(52)	(31)
Provisions charged to operations									560	(243)
Balance at end of period	11,027				10,519				11,027	10,519	10,793
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				3,226				3,129	3,226	3,129
Charge- offs									(174)	(373)
Recoveries									26	25
Net charge- offs									(148)	(348)
Provisions charged to operations									183	445
Balance at end of period	3,261				3,226				3,261	3,226	3,129
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				9,672				8,622	9,672	8,622
Charge- offs									(395)	(330)
Recoveries									106	66
Net charge- offs									(289)	(264)
Provisions charged to operations									1,290	1,314
Balance at end of period	10,673				9,672				10,673	9,672	8,622
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				15,334				12,421	15,334	12,421
Charge- offs									(2,257)	(1,344)
Recoveries									92	1,033
Net charge- offs									(2,165)	(311)
Provisions charged to operations									(18)	3,224
Balance at end of period	13,151				15,334				13,151	15,334	12,421
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				2,793				2,804	2,793	2,804
Charge- offs									(1,066)	(913)
Recoveries									245	180
Net charge- offs									(821)	(733)
Provisions charged to operations									1,093	722
Balance at end of period	3,065				2,793				3,065	2,793	2,804
Other Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				2,481				4,045	2,481	4,045
Charge- offs									(16)	(3,727)
Recoveries									361	23
Net charge- offs									345	(3,704)
Provisions charged to operations									(403)	2,140
Balance at end of period	2,423				2,481				2,423	2,481	4,045
Acquired Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period				$ 1,446				$ 1,277	1,446	1,277
Charge- offs									(720)	(157)
Recoveries									36	77
Net charge- offs									(684)	(80)
Provisions charged to operations									699	249
Balance at end of period	$ 1,461				$ 1,446				$ 1,461	$ 1,446	$ 1,277

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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