Loan Commitments and Other Related Activities Loan Commitments and Other Related Activities - Summary of Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commitments to make loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	$ 48,999	$ 28,731
Variable Rate	0	0
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	7,119	8,293
Variable Rate	48,750	31,731
Unused lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	89,040	128,313
Variable Rate	$ 701,326	$ 526,271