Loans and Allowance for Loan Losses - Summary of Allowance for Loan Losses and Related Loans Receivable Disaggregated by Impairment Method (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]
Individually evaluated for impairment	$ 87
Collectively evaluated for impairment	18,093	$ 16,768
Total loans	18,180	16,768
Individually evaluated for impairment	4,145	740
Collectively evaluated for impairment	2,222,583	1,559,032
Total loans	2,226,728	1,559,772
Residential Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	5,141	4,946
Total loans	5,141	4,946
Individually evaluated for impairment	764	647
Collectively evaluated for impairment	916,802	603,684
Total loans	917,566	604,331
Commercial Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	10,905	9,626
Total loans	10,905	9,626
Individually evaluated for impairment	3,161
Collectively evaluated for impairment	1,057,413	757,957
Total loans	1,060,574	757,957
Home Equity
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	461	517
Total loans	461	517
Individually evaluated for impairment	92	88
Collectively evaluated for impairment	80,583	69,248
Total loans	80,675	69,336
Commercial & Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Individually evaluated for impairment	87
Collectively evaluated for impairment	1,388	1,415
Total loans	1,475	1,415
Individually evaluated for impairment	128	5
Collectively evaluated for impairment	133,108	93,707
Total loans	133,236	93,712
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	198	264
Total loans	198	264
Collectively evaluated for impairment	34,677	34,436
Total loans	$ 34,677	$ 34,436