Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Cash and cash equivalents	$ 390,081	$ 263,893
Certificates of deposit with banks	9,582	11,803
Investment securities available-for-sale	439,023	410,624
Equity securities	29,809	27,585
Bank-owned life insurance	42,011	41,262
Carrying Value
Financial Assets:
Cash and cash equivalents	390,081	263,893
Certificates of deposit with banks	9,582	11,803
Investment securities available-for-sale	439,023	410,624
Equity securities	29,809	27,585
Loans held-for-sale		1,062
Loans receivable, net	1,738,999	1,427,900
Servicing Assets	2,667	2,942
Accrued interest receivable	8,513	7,793
Bank-owned life insurance	42,011	41,262
Financial Liabilities:
Deposits	2,398,940	1,982,389
Repurchase agreements	11,139	10,266
FHLB and other borrowings	0
Accrued interest payable	802	572
Subordinated debt	72,966	43,407
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	390,081	263,893
Certificates of deposit with banks	9,657	11,986
Investment securities available-for-sale	439,023	410,624
Equity securities	29,809	27,585
Loans held-for-sale		1,062
Loans receivable, net	1,748,759	1,434,275
Servicing Assets	2,667	2,942
Accrued interest receivable	8,513	7,793
Bank-owned life insurance	42,011	41,262
Financial Liabilities:
Deposits	2,375,650	1,964,860
Repurchase agreements	11,139	10,266
FHLB and other borrowings	0
Accrued interest payable	802	572
Subordinated debt	73,825	45,536
Interest rate swap | Carrying Value
Financial Assets:
Derivative asset	8,444	13,822
Financial Liabilities:
Derivative liability	8,444	13,822
Interest rate swap | Estimated Fair Value
Financial Assets:
Derivative asset	8,444	13,822
Financial Liabilities:
Derivative liability	8,444	13,822
Fair value hedge | Carrying Value
Financial Assets:
Derivative asset	1,699	2,215
Financial Liabilities:
Derivative liability	1,129	2,141
Fair value hedge | Estimated Fair Value
Financial Assets:
Derivative asset	1,699	2,215
Financial Liabilities:
Derivative liability	1,129	2,141
Quoted Prices in Active Markets for Identical Assets (Level I) | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	390,081	263,893
Certificates of deposit with banks	0	0
Investment securities available-for-sale	0	0
Equity securities	729	472
Loans held-for-sale		0
Loans receivable, net	0	0
Servicing Assets	0	0
Accrued interest receivable	0	0
Bank-owned life insurance	0	0
Financial Liabilities:
Deposits	0	0
Repurchase agreements	0	0
FHLB and other borrowings	0
Accrued interest payable	0	0
Subordinated debt	0	0
Quoted Prices in Active Markets for Identical Assets (Level I) | Interest rate swap | Estimated Fair Value
Financial Assets:
Derivative asset	0	0
Financial Liabilities:
Derivative liability	0	0
Quoted Prices in Active Markets for Identical Assets (Level I) | Fair value hedge | Estimated Fair Value
Financial Assets:
Derivative asset	0	0
Financial Liabilities:
Derivative liability	0	0
Significant Other Observable Inputs (Level II) | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	0	0
Certificates of deposit with banks	9,657	11,986
Investment securities available-for-sale	397,609	366,945
Equity securities	0	0
Loans held-for-sale		1,062
Loans receivable, net	0	0
Servicing Assets	0	0
Accrued interest receivable	2,621	2,770
Bank-owned life insurance	42,011	41,262
Financial Liabilities:
Deposits	2,375,650	1,964,860
Repurchase agreements	11,139	10,266
FHLB and other borrowings	0
Accrued interest payable	802	572
Subordinated debt	73,825	45,536
Significant Other Observable Inputs (Level II) | Interest rate swap | Estimated Fair Value
Financial Assets:
Derivative asset	8,444	13,822
Financial Liabilities:
Derivative liability	8,444	13,822
Significant Other Observable Inputs (Level II) | Fair value hedge | Estimated Fair Value
Financial Assets:
Derivative asset	1,699	2,215
Financial Liabilities:
Derivative liability	1,129	2,141
Significant Unobservable Inputs (Level III) | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	0	0
Certificates of deposit with banks	0	0
Investment securities available-for-sale	41,414	43,679
Equity securities	29,080	27,113
Loans held-for-sale		0
Loans receivable, net	1,748,759	1,434,275
Servicing Assets	2,667	2,942
Accrued interest receivable	5,892	5,023
Bank-owned life insurance	0	0
Financial Liabilities:
Deposits	0	0
Repurchase agreements	0	0
FHLB and other borrowings	0
Accrued interest payable	0	0
Subordinated debt	0	0
Significant Unobservable Inputs (Level III) | Interest rate swap | Estimated Fair Value
Financial Assets:
Derivative asset	0	0
Financial Liabilities:
Derivative liability	0	0
Significant Unobservable Inputs (Level III) | Fair value hedge | Estimated Fair Value
Financial Assets:
Derivative asset	0
Financial Liabilities:
Derivative liability	$ 0	$ 0