Revenue Recognition - Summary of Company's Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Noninterest income:
Loan servicing income	$ 458	$ 633	$ 480
Earnings on bank-owned life insurance	2,233	2,240	1,336
Net gain from sales of loans	361	328	771
Net gain from sales of investment securities	4,046	5,002	7,760
Other income	4,602	3,197	1,754
Total noninterest income	23,740	23,194	14,475
Service charges on deposit accounts
Noninterest income:
Noninterest income	2,032	2,005	1,715
Other service fee income
Noninterest income:
Noninterest income	473	459	311
Debit card interchange income
Noninterest income:
Noninterest income	787	777	348
Trust custodial account fees
Noninterest income:
Noninterest income	7,222	7,296	0
Escrow and exchange fees
Noninterest income:
Noninterest income	1,526	1,257	0
Within Scope
Noninterest income:
Other income	282	199	217
Total noninterest income	12,322	11,993	2,591
Within Scope | Service charges on deposit accounts
Noninterest income:
Noninterest income	2,032	2,005	1,715
Within Scope | Other service fee income
Noninterest income:
Noninterest income	473	459	311
Within Scope | Debit card interchange income
Noninterest income:
Noninterest income	787	777	348
Within Scope | Trust custodial account fees
Noninterest income:
Noninterest income	7,222	7,296	0
Within Scope | Escrow and exchange fees
Noninterest income:
Noninterest income	1,526	1,257	0
Out of Scope
Noninterest income:
Loan servicing income	458	633	480
Earnings on bank-owned life insurance	2,233	2,240	1,336
Net gain from sales of loans	361	328	771
Net gain from sales of investment securities	4,046	5,002	7,760
Other income	4,320	2,998	1,537
Total noninterest income	$ 11,418	$ 11,201	$ 11,884