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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Loans and Allowance for Loan Losses - Summary of loan balances by type (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans and Allowance for Loan Losses
Loans, gross	$ 1,138,008	$ 889,409
Allowance for loan losses	9,159	7,725	$ 6,452
Unearned income and (unamortized premiums), net	1,265	732
Loans, net	1,127,584	880,952
Commercial \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	683,602	526,657
Allowance for loan losses	5,548	4,832	4,266
Commercial \| Commercial and Industrial
Loans and Allowance for Loan Losses
Loans, gross	137,328	98,150
Allowance for loan losses	1,474	768	1,032
Commercial \| Construction
Loans and Allowance for Loan Losses
Loans, gross	153,339	123,444
Allowance for loan losses	1,285	1,191	375
Consumer \| Residential
Loans and Allowance for Loan Losses
Loans, gross	131,431	108,926
Allowance for loan losses	518	626	500
Consumer \| Nonresidential
Loans and Allowance for Loan Losses
Loans, gross	32,308	32,232
Allowance for loan losses	334	$ 268	$ 121
Originated Loan Portfolio
Loans and Allowance for Loan Losses
Loans, gross	1,007,010
Allowance for loan losses	9,159
Unearned income and (unamortized premiums), net	1,265
Loans, net	996,586
Originated Loan Portfolio \| Commercial \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	616,614
Originated Loan Portfolio \| Commercial \| Commercial and Industrial
Loans and Allowance for Loan Losses
Loans, gross	128,909
Originated Loan Portfolio \| Commercial \| Construction
Loans and Allowance for Loan Losses
Loans, gross	141,694
Originated Loan Portfolio \| Consumer \| Residential
Loans and Allowance for Loan Losses
Loans, gross	87,609
Originated Loan Portfolio \| Consumer \| Nonresidential
Loans and Allowance for Loan Losses
Loans, gross	32,184
Acquired Loan Portfolio
Loans and Allowance for Loan Losses
Loans, gross	130,998
Loans, net	130,998
Acquired Loan Portfolio \| Commercial \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	66,988
Acquired Loan Portfolio \| Commercial \| Commercial and Industrial
Loans and Allowance for Loan Losses
Loans, gross	8,419
Acquired Loan Portfolio \| Commercial \| Construction
Loans and Allowance for Loan Losses
Loans, gross	11,645
Acquired Loan Portfolio \| Consumer \| Residential
Loans and Allowance for Loan Losses
Loans, gross	43,822
Acquired Loan Portfolio \| Consumer \| Nonresidential
Loans and Allowance for Loan Losses
Loans, gross	$ 124