Fair Value of Assets and Liabilities - Summary of Estimated Fair Values of Company Financial Instruments (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Financial assets
Total available-for-sale securities	$ 1,212,698,000	$ 1,218,985,000
Held-to-maturity securities	2,979,000	2,954,000
Equity securities, at fair value	362,000	311,000
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks	161,236,000	144,806,000
Federal funds sold	7,898,000	7,627,000
Certificates of deposit investments	0	0
Total available-for-sale securities	0	0
Held-to-maturity securities	2,979,000	2,953,000
Equity securities, at fair value	362,000	311,000
Loans held for sale	0	0
Loans net of allowance for credit losses	0	0
Interest receivable	0	0
Federal Reserve Bank stock	0	0
Federal Home Loan Bank stock	0	0
Financial liabilities
Deposits	0	0
Federal funds purchased		0
Other borrowings		0
Securities sold under agreements to repurchase	0	0
Interest payable	0	0
Federal Home Loan Bank borrowings	0	0
Fair Value, Inputs, Level 1 [Member] | Subordinated Debt
Financial liabilities
Subordinated debt, net	0	0
Fair Value, Inputs, Level 1 [Member] | Junior Subordinated Debentures
Financial liabilities
Subordinated debt, net	0	0
Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and due from banks	0	0
Federal funds sold	0	0
Certificates of deposit investments	1,715,000	1,470,000
Total available-for-sale securities	1,202,698,000	1,209,736,000
Held-to-maturity securities	0	0
Equity securities, at fair value	0	0
Loans held for sale	999,000	338,000
Loans net of allowance for credit losses	0	0
Interest receivable	28,729,000	28,357,000
Federal Reserve Bank stock	17,050,000	17,050,000
Federal Home Loan Bank stock	23,365,000	18,440,000
Financial liabilities
Deposits	4,200,115,000	4,550,222,000
Federal funds purchased		0
Other borrowings		0
Securities sold under agreements to repurchase	228,486,000	221,260,000
Interest payable	4,732,000	3,346,000
Federal Home Loan Bank borrowings	591,398,000	459,327,000
Fair Value, Inputs, Level 2 [Member] | Subordinated Debt
Financial liabilities
Subordinated debt, net	89,944,000	87,977,000
Fair Value, Inputs, Level 2 [Member] | Junior Subordinated Debentures
Financial liabilities
Subordinated debt, net	17,186,000	17,164,000
Level 3
Financial assets
Cash and due from banks	0	0
Federal funds sold	0	0
Certificates of deposit investments	0	0
Total available-for-sale securities	10,000,000	9,250,000
Held-to-maturity securities	0	0
Equity securities, at fair value	0	0
Loans held for sale	0	0
Loans net of allowance for credit losses	4,497,336,000	4,460,661,000
Interest receivable	0	0
Federal Reserve Bank stock	0	0
Federal Home Loan Bank stock	0	0
Financial liabilities
Deposits	824,300,000	707,526,000
Federal funds purchased		0
Other borrowings		0
Securities sold under agreements to repurchase	0	0
Interest payable	0	0
Federal Home Loan Bank borrowings	0	0
Level 3 | Subordinated Debt
Financial liabilities
Subordinated debt, net	0
Level 3 | Junior Subordinated Debentures
Financial liabilities
Subordinated debt, net	0	0
Carrying Amount
Financial assets
Cash and due from banks	161,236,000	144,806,000
Federal funds sold	7,898,000	7,627,000
Certificates of deposit investments	1,715,000	1,470,000
Total available-for-sale securities	1,212,698,000	1,218,986,000
Held-to-maturity securities	2,979,000	2,953,000
Equity securities, at fair value	362,000	311,000
Loans held for sale	999,000	338,000
Loans net of allowance for credit losses	4,701,409,000	4,766,780,000
Interest receivable	28,729,000	28,357,000
Federal Reserve Bank stock	17,050,000	17,050,000
Federal Home Loan Bank stock	23,365,000	18,440,000
Financial liabilities
Deposits	5,030,778,000	5,257,001,000
Federal funds purchased		0
Other borrowings		0
Securities sold under agreements to repurchase	228,664,000	221,414,000
Interest payable	4,732,000	3,346,000
Federal Home Loan Bank borrowings	595,021,000	465,071,000
Carrying Amount | Subordinated Debt
Financial liabilities
Subordinated debt, net	94,593,000	94,553,000
Carrying Amount | Junior Subordinated Debentures
Financial liabilities
Subordinated debt, net	19,406,000	19,364,000
Fair Value
Financial assets
Cash and due from banks	161,236,000	144,806,000
Federal funds sold	7,898,000	7,627,000
Certificates of deposit investments	1,715,000	1,470,000
Total available-for-sale securities	1,212,698,000	1,218,986,000
Held-to-maturity securities	2,979,000	2,953,000
Equity securities, at fair value	362,000	311,000
Loans held for sale	999,000	338,000
Loans net of allowance for credit losses	4,497,336,000	4,460,661,000
Interest receivable	28,729,000	28,357,000
Federal Reserve Bank stock	17,050,000	17,050,000
Federal Home Loan Bank stock	23,365,000	18,440,000
Financial liabilities
Deposits	5,024,415,000	5,257,748,000
Federal funds purchased		0
Other borrowings		0
Securities sold under agreements to repurchase	228,486,000	221,260,000
Interest payable	4,732,000	3,346,000
Federal Home Loan Bank borrowings	591,398,000	459,327,000
Fair Value | Subordinated Debt
Financial liabilities
Subordinated debt, net	89,944,000	87,977,000
Fair Value | Junior Subordinated Debentures
Financial liabilities
Subordinated debt, net	$ 17,186,000	$ 17,164,000