Allowance for Loan and Lease Losses - Segregated By Originated and Acquired Loan and Lease Portfolio and Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			$ 35,755
Provision (credit)	$ 402	$ 782	2,147	$ 2,615
Ending Balance	38,038		38,038
Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	36,960	32,968	35,598	31,312
Charge-offs	(338)	(246)	(1,408)	(1,271)
Recoveries	350	366	1,334	1,197
Provision (credit)	931	868	2,379	2,718
Ending Balance	37,903	33,956	37,903	33,956
Total Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	197	157	157	692
Charge-offs	(45)	(31)	(345)	(709)
Recoveries	512	116	555	276
Provision (credit)	(529)	(86)	(232)	(103)
Ending Balance	135	156	135	156
Commercial and industrial \| Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,842	8,937	9,389	10,495
Charge-offs	(85)	(133)	(162)	(584)
Recoveries	(18)	110	112	217
Provision (credit)	951	340	2,351	(874)
Ending Balance	11,690	9,254	11,690	9,254
Commercial and industrial \| Total Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	50	47	0	433
Charge-offs	0	(12)	(74)	(399)
Recoveries	0	20	0	20
Provision (credit)	(50)	(55)	74	(54)
Ending Balance	0	0	0	0
Commercial real estate \| Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,121	18,229	19,836	15,479
Charge-offs	0	0	(21)	(12)
Recoveries	264	216	717	636
Provision (credit)	70	331	(1,077)	2,673
Ending Balance	19,455	18,776	19,455	18,776
Commercial real estate \| Total Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	87	65	97	61
Charge-offs	(10)	0	(84)	(182)
Recoveries	499	96	524	256
Provision (credit)	(501)	(84)	(462)	(58)
Ending Balance	75	77	75	77
Residential real estate \| Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,761	4,486	5,149	4,070
Charge-offs	(41)	(19)	(483)	(220)
Recoveries	33	17	169	49
Provision (credit)	(262)	223	656	808
Ending Balance	5,491	4,707	5,491	4,707
Residential real estate \| Total Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	54	23	54	198
Charge-offs	(34)	(19)	(186)	(35)
Recoveries	12	0	24	0
Provision (credit)	22	53	162	(106)
Ending Balance	54	57	54	57
Consumer and other \| Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,236	1,316	1,224	1,268
Charge-offs	(212)	(94)	(742)	(455)
Recoveries	71	23	336	295
Provision (credit)	172	(26)	449	111
Ending Balance	1,267	1,219	1,267	1,219
Consumer and other \| Total Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6	22	6	0
Charge-offs	(1)	0	(1)	(93)
Recoveries	1	0	7	0
Provision (credit)	0	0	(6)	115
Ending Balance	6	22	6	22
Leases \| Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (credit)	0	0	0	0
Ending Balance	0	0	0	0
Leases \| Total Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0
Charge-offs	0
Recoveries	0
Provision (credit)	0
Ending Balance	0		0
Covered Loans \| Total Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		0	0	0
Charge-offs		0	0	0
Recoveries		0	0	0
Provision (credit)		0	0	0
Ending Balance	$ 0	$ 0	$ 0	$ 0

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
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