Fair Value Measurements - Schedule of Estimated Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financial assets:
Investment securities available for sale	$ 379,122		$ 247,633
Marketable equity securities	8,551		9,052
Investment securities held to maturity	19,264		10,000
Purchased receivables, net	20,118		13,922
Mortgage servicing rights
Financial assets:
Servicing rights	13,080	$ 12,835	11,218	$ 10,589	$ 10,721	$ 11,920
Commercial servicing rights
Financial assets:
Servicing rights	1,278		1,310
Interest rate swaps
Financial assets:
Derivative assets	6,132		7,387
Financial liabilities:
Derivative liabilities	7,032		9,122
Interest rate lock commitments
Financial assets:
Derivative assets	3,248		4,034
Retail interest rate contracts
Financial assets:
Derivative assets	126
Financial liabilities:
Derivative liabilities			880
Level 1 inputs:
Financial assets:
Investment securities available for sale	121,787		58,865
Marketable equity securities	8,551		9,052
Level 1 inputs: | Mortgage servicing rights
Financial assets:
Servicing rights	0		0
Level 1 inputs: | Commercial servicing rights
Financial assets:
Servicing rights	0		0
Level 1 inputs: | Interest rate swaps
Financial assets:
Derivative assets	0		0
Financial liabilities:
Derivative liabilities	0		0
Level 1 inputs: | Interest rate lock commitments
Financial assets:
Derivative assets	0		0
Level 1 inputs: | Retail interest rate contracts
Financial assets:
Derivative assets	0
Financial liabilities:
Derivative liabilities			0
Level 1 inputs: | Carrying Amount
Financial assets:
Cash, due from banks and deposits in other banks	492,279		115,965
Investment securities available for sale	121,787		58,865
Marketable equity securities	8,551		9,052
Level 1 inputs: | Fair Value
Financial assets:
Cash, due from banks and deposits in other banks	492,279		115,965
Investment securities available for sale	121,787		58,865
Marketable equity securities	8,551		9,052
Level 2 inputs:
Financial assets:
Investment securities available for sale	257,335		188,768
Marketable equity securities	0		0
Level 2 inputs: | Mortgage servicing rights
Financial assets:
Servicing rights	0		0
Level 2 inputs: | Commercial servicing rights
Financial assets:
Servicing rights	0		0
Level 2 inputs: | Interest rate swaps
Financial assets:
Derivative assets	6,132		7,387
Financial liabilities:
Derivative liabilities	7,032		9,122
Level 2 inputs: | Interest rate lock commitments
Financial assets:
Derivative assets	0		0
Level 2 inputs: | Retail interest rate contracts
Financial assets:
Derivative assets	126
Financial liabilities:
Derivative liabilities			880
Level 2 inputs: | Carrying Amount
Financial assets:
Investment securities available for sale	256,485		188,768
Investment in Federal Home Loan Bank stock	3,110		2,551
Loans held for sale	106,224		146,178
Accrued interest receivable	7,546		7,979
Financial liabilities:
Deposits	2,296,541		1,824,981
Borrowings	14,605		14,817
Accrued interest payable	129		65
Level 2 inputs: | Carrying Amount | Interest rate swaps
Financial assets:
Derivative assets	6,132		7,387
Financial liabilities:
Derivative liabilities	7,032		9,122
Level 2 inputs: | Carrying Amount | Retail interest rate contracts
Financial liabilities:
Derivative liabilities	0		880
Level 2 inputs: | Fair Value
Financial assets:
Investment securities available for sale	256,485		188,768
Investment in Federal Home Loan Bank stock	3,110		2,551
Loans held for sale	106,224		146,178
Accrued interest receivable	7,546		7,979
Financial liabilities:
Deposits	2,297,426		1,826,990
Borrowings	14,809		15,538
Accrued interest payable	129		65
Level 2 inputs: | Fair Value | Interest rate swaps
Financial assets:
Derivative assets	6,132		7,387
Financial liabilities:
Derivative liabilities	7,032		9,122
Level 2 inputs: | Fair Value | Retail interest rate contracts
Financial liabilities:
Derivative liabilities	0		880
Level 3 inputs:
Financial assets:
Investment securities available for sale	0		0
Marketable equity securities	0		0
Level 3 inputs: | Mortgage servicing rights
Financial assets:
Servicing rights	13,080		11,218
Level 3 inputs: | Commercial servicing rights
Financial assets:
Servicing rights	1,278		1,310
Level 3 inputs: | Interest rate swaps
Financial assets:
Derivative assets	0		0
Financial liabilities:
Derivative liabilities	0		0
Level 3 inputs: | Interest rate lock commitments
Financial assets:
Derivative assets	3,248		4,034
Level 3 inputs: | Retail interest rate contracts
Financial assets:
Derivative assets	0
Financial liabilities:
Derivative liabilities			0
Level 3 inputs: | Carrying Amount
Financial assets:
Investment securities held to maturity	20,000		10,000
Loans	1,450,657		1,444,051
Purchased receivables, net	20,118		13,922
Financial liabilities:
Junior subordinated debentures	10,310		10,310
Level 3 inputs: | Carrying Amount | Mortgage servicing rights
Financial assets:
Servicing rights	13,080		11,218
Level 3 inputs: | Carrying Amount | Commercial servicing rights
Financial assets:
Servicing rights	1,278		1,310
Level 3 inputs: | Carrying Amount | Interest rate lock commitments
Financial assets:
Derivative assets	3,248		4,034
Level 3 inputs: | Fair Value
Financial assets:
Investment securities held to maturity	19,264		10,000
Loans	1,419,567		1,414,179
Purchased receivables, net	20,118		13,922
Financial liabilities:
Junior subordinated debentures	9,833		10,475
Level 3 inputs: | Fair Value | Mortgage servicing rights
Financial assets:
Servicing rights	13,080		11,218
Level 3 inputs: | Fair Value | Commercial servicing rights
Financial assets:
Servicing rights	1,278		1,310
Level 3 inputs: | Fair Value | Interest rate lock commitments
Financial assets:
Derivative assets	$ 3,248		$ 4,034