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Allowance for Loan and Lease Losses - Allowance for Originated and Acquired Loan and Lease Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 43,410					$ 43,410
Provision for loan and lease losses	$ (1,000)	$ 1,320	$ 601	445	$ 2,058	$ 272	$ 1,045	$ 567	1,366	$ 3,942	$ 4,161
Ending Balance	39,892				43,410				39,892	43,410
Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				43,321				39,686	43,321	39,686
Charge-offs									(5,572)	(2,127)
Recoveries									747	1,865
Provision for loan and lease losses									1,318	3,897
Ending Balance	39,814				43,321				39,814	43,321	39,686
Acquired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				89				85	89	85
Charge-offs									(218)	(313)
Recoveries									159	272
Provision for loan and lease losses									48	45
Ending Balance	78				89				78	89	85
Commercial and industrial | Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				11,217				11,812	11,217	11,812
Charge-offs									(653)	(293)
Recoveries									70	50
Provision for loan and lease losses									(93)	(352)
Ending Balance	10,541				11,217				10,541	11,217	11,812
Commercial and industrial | Acquired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				55				25	55	25
Charge-offs									(43)	(41)
Recoveries									33	106
Provision for loan and lease losses									(45)	(35)
Ending Balance	0				55				0	55	25
Commercial real estate | Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				23,483				20,412	23,483	20,412
Charge-offs									(4,013)	(60)
Recoveries									100	812
Provision for loan and lease losses									1,987	2,319
Ending Balance	21,557				23,483				21,557	23,483	20,412
Commercial real estate | Acquired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				0				0	0	0
Charge-offs									(2)	(82)
Recoveries									74	31
Provision for loan and lease losses									(21)	51
Ending Balance	51				0				51	0	0
Residential real estate | Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				7,317				6,161	7,317	6,161
Charge-offs									(90)	(424)
Recoveries									283	324
Provision for loan and lease losses									(1,150)	1,256
Ending Balance	6,360				7,317				6,360	7,317	6,161
Residential real estate | Acquired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				28				54	28	54
Charge-offs									(166)	(190)
Recoveries									51	135
Provision for loan and lease losses									108	29
Ending Balance	21				28				21	28	54
Consumer and other | Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,304				1,301	1,304	1,301
Charge-offs									(816)	(1,350)
Recoveries									294	679
Provision for loan and lease losses									574	674
Ending Balance	1,356				1,304				1,356	1,304	1,301
Consumer and other | Acquired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				6				6	6	6
Charge-offs									(7)	0
Recoveries									1	0
Provision for loan and lease losses									6	0
Ending Balance	6				6				6	6	6
Finance leases | Originated Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				0				0	0	0
Charge-offs									0	0
Recoveries									0	0
Provision for loan and lease losses									0	0
Ending Balance	0				0				0	0	0
Finance leases | Acquired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 0				$ 0	0	0
Charge-offs									0	0
Recoveries									0	0
Provision for loan and lease losses									0	0
Ending Balance	$ 0				$ 0				$ 0	$ 0	$ 0

X

- Definition

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

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

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