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Loans and the Allowance for Loan Losses (Details) - Allowance for loan losses - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for loan and lease losses
Allowance for loan and lease losses, individually evaluated for impairment	$ 36	$ 39
Allowance for loan and lease losses, collectively evaluated for impairment	33,718	29,909
Allowance for loan and lease losses, acquired portfolio	1,200	1,800
Allowance for loan and lease losses, acquired with deteriorated credit quality
Allowance for loan and lease losses, total	34,954	31,748	$ 25,744	$ 26,572
Gross loans
Loans Receivable, individually evaluated for impairment	59,932	84,664
Loans Receivable, collectively evaluated for impairment	4,171,343	3,639,851
Loans Receivable, acquired portfolio	311,115	447,612
Loans Receivables, acquired with deteriorated credit quality	2,509	2,683
Loans Receivable, Total	4,544,899	4,174,810
Commercial Portfolio Segment [Member]
Allowance for loan and lease losses
Allowance for loan and lease losses, individually evaluated for impairment
Allowance for loan and lease losses, collectively evaluated for impairment	9,675	8,032
Allowance for loan and lease losses, acquired portfolio	200	200
Allowance for loan and lease losses, acquired with deteriorated credit quality
Allowance for loan and lease losses, total	9,875	8,233	6,632	10,949
Gross loans
Loans Receivable, individually evaluated for impairment	29,896	49,761
Loans Receivable, collectively evaluated for impairment	949,129	757,923
Loans Receivable, acquired portfolio	7,224	13,715
Loans Receivables, acquired with deteriorated credit quality	2,509	2,683
Loans Receivable, Total	988,758	824,082
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan and lease losses
Allowance for loan and lease losses, individually evaluated for impairment	7	39
Allowance for loan and lease losses, collectively evaluated for impairment	17,840	15,472
Allowance for loan and lease losses, acquired portfolio	1,000	1,600
Allowance for loan and lease losses, acquired with deteriorated credit quality
Allowance for loan and lease losses, total	18,847	17,112	12,583	10,926
Gross loans
Loans Receivable, individually evaluated for impairment	18,327	25,038
Loans Receivable, collectively evaluated for impairment	2,500,132	2,190,686
Loans Receivable, acquired portfolio	259,708	377,185
Loans Receivables, acquired with deteriorated credit quality
Loans Receivable, Total	2,778,167	2,592,909
Construction Loans [Member]
Allowance for loan and lease losses
Allowance for loan and lease losses, individually evaluated for impairment
Allowance for loan and lease losses, collectively evaluated for impairment	4,519	4,747
Allowance for loan and lease losses, acquired portfolio
Allowance for loan and lease losses, acquired with deteriorated credit quality
Allowance for loan and lease losses, total	4,519	4,747	4,789	3,253
Gross loans
Loans Receivable, individually evaluated for impairment	9,240	6,662
Loans Receivable, collectively evaluated for impairment	456,149	476,554
Loans Receivable, acquired portfolio
Loans Receivables, acquired with deteriorated credit quality
Loans Receivable, Total	465,389	483,216
Residential Portfolio Segment [Member]
Allowance for loan and lease losses
Allowance for loan and lease losses, individually evaluated for impairment	29
Allowance for loan and lease losses, collectively evaluated for impairment	1,237	1,051
Allowance for loan and lease losses, acquired portfolio
Allowance for loan and lease losses, acquired with deteriorated credit quality
Allowance for loan and lease losses, total	1,266	1,050	958	976
Gross loans
Loans Receivable, individually evaluated for impairment	2,469	3,203
Loans Receivable, collectively evaluated for impairment	263,449	212,350
Loans Receivable, acquired portfolio	44,073	56,242
Loans Receivables, acquired with deteriorated credit quality
Loans Receivable, Total	309,991	271,795
Consumer Portfolio Segment [Member]
Allowance for loan and lease losses
Allowance for loan and lease losses, individually evaluated for impairment
Allowance for loan and lease losses, collectively evaluated for impairment	2	2
Allowance for loan and lease losses, acquired portfolio
Allowance for loan and lease losses, acquired with deteriorated credit quality
Allowance for loan and lease losses, total	2	1	3	4
Gross loans
Loans Receivable, individually evaluated for impairment
Loans Receivable, collectively evaluated for impairment	2,484	2,338
Loans Receivable, acquired portfolio	110	470
Loans Receivables, acquired with deteriorated credit quality
Loans Receivable, Total	2,594	2,808
Unallocated Financing Receivables [Member]
Allowance for loan and lease losses
Allowance for loan and lease losses, individually evaluated for impairment
Allowance for loan and lease losses, collectively evaluated for impairment	445	605
Allowance for loan and lease losses, acquired portfolio
Allowance for loan and lease losses, acquired with deteriorated credit quality
Allowance for loan and lease losses, total	$ 445	$ 605	$ 779	$ 464

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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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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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