Loans and Allowance for Loan Losses - Loans Receivable Disaggregated by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment [Line Items]
Loans receivable	$ 2,226,728	$ 1,559,772
Residential Mortgage
Financing Receivable Recorded Investment [Line Items]
Loans receivable	917,566	604,331
Residential Mortgage | Performing
Financing Receivable Recorded Investment [Line Items]
Loans receivable	915,642	603,708
Residential Mortgage | Non-Performing Loans
Financing Receivable Recorded Investment [Line Items]
Loans receivable	1,924	623
Home Equity
Financing Receivable Recorded Investment [Line Items]
Loans receivable	80,675	69,336
Home Equity | Performing
Financing Receivable Recorded Investment [Line Items]
Loans receivable	80,663	69,323
Home Equity | Non-Performing Loans
Financing Receivable Recorded Investment [Line Items]
Loans receivable	12	13
Consumer
Financing Receivable Recorded Investment [Line Items]
Loans receivable	34,677	34,436
Consumer | Performing
Financing Receivable Recorded Investment [Line Items]
Loans receivable	34,677	34,436
Commercial Mortgage
Financing Receivable Recorded Investment [Line Items]
Loans receivable	1,060,574	757,957
Commercial Mortgage | 1-6 (Pass)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	1,050,037	753,338
Commercial Mortgage | 7 (Special Mention)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	7,360	4,619
Commercial Mortgage | 8 (Substandard)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	3,177
Commercial & Industrial
Financing Receivable Recorded Investment [Line Items]
Loans receivable	133,236	93,712
Commercial & Industrial | 1-6 (Pass)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	123,900	85,821
Commercial & Industrial | 7 (Special Mention)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	4,289	4,186
Commercial & Industrial | 8 (Substandard)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	$ 5,047	$ 3,705