Fair Value of Assets and Liabilities - Summary of Estimated Fair Values of Company Financial Instruments (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Financial Assets
Total available-for-sale securities	$ 1,087,948,000	$ 879,240,000
Held-to-maturity securities	7,125,000	5,119,000
Equity securities	300,000	218,000
Fair Value, Inputs, Level 1 [Member]
Financial Assets
Cash and due from banks	408,226,000	415,973,000
Federal funds sold	1,321,000	1,308,000
Certificates of deposit investments	0	0
Total available-for-sale securities	0	0
Held-to-maturity securities	0	0
Equity securities	300,000	218,000
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
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	2,695,000	2,695,000
Total available-for-sale securities	1,087,334,000	878,446,000
Held-to-maturity securities	7,125,000	5,119,000
Equity securities	0	0
Loans held for sale	4,693,000	1,924,000
Loans net of allowance for credit losses	0	0
Interest receivable	20,218,000	19,287,000
Federal Reserve Bank stock	9,401,000	9,401,000
Federal Home Loan Bank stock	5,450,000	5,450,000
Financial Liabilities
Deposits	3,926,107,000	3,215,715,000
Securities sold under agreements to repurchase	212,514,000	206,945,000
Interest payable	3,214,000	2,345,000
Federal Home Loan Bank borrowings	117,670,000	96,669,000
Fair Value, Inputs, Level 2 [Member] \| Subordinated Debt
Financial Liabilities
Subordinated debt, net	94,289,000	94,253,000
Fair Value, Inputs, Level 2 [Member] \| Junior Subordinated Debentures
Financial Liabilities
Subordinated debt, net	14,495,000	14,604,000
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	614,000	794,000
Held-to-maturity securities	0	0
Equity securities	0	0
Loans held for sale	0	0
Loans net of allowance for credit losses	3,839,827,000	3,056,344,000
Interest receivable	0	0
Federal Reserve Bank stock	0	0
Federal Home Loan Bank stock	0	0
Financial Liabilities
Deposits	814,695,000	481,390,000
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	0
Level 3 \| Junior Subordinated Debentures
Financial Liabilities
Subordinated debt, net	0	0
Carrying Amount
Financial Assets
Cash and due from banks	408,226,000	415,973,000
Federal funds sold	1,321,000	1,308,000
Certificates of deposit investments	2,695,000	2,695,000
Total available-for-sale securities	1,087,948,000	879,240,000
Held-to-maturity securities	7,045,000	5,016,000
Equity securities	300,000	218,000
Loans held for sale	4,693,000	1,924,000
Loans net of allowance for credit losses	3,882,988,000	3,094,585,000
Interest receivable	20,218,000	19,287,000
Federal Reserve Bank stock	9,401,000	9,401,000
Federal Home Loan Bank stock	5,450,000	5,450,000
Financial Liabilities
Deposits	4,737,693,000	3,692,784,000
Securities sold under agreements to repurchase	212,503,000	206,937,000
Interest payable	3,214,000	2,345,000
Federal Home Loan Bank borrowings	116,861,000	93,969,000
Carrying Amount \| Subordinated Debt
Financial Liabilities
Subordinated debt, net	94,289,000	94,253,000
Carrying Amount \| Junior Subordinated Debentures
Financial Liabilities
Subordinated debt, net	19,069,000	19,027,000
Fair Value
Financial Assets
Cash and due from banks	408,226,000	415,973,000
Federal funds sold	1,321,000	1,308,000
Certificates of deposit investments	2,695,000	2,695,000
Total available-for-sale securities	1,087,948,000	879,240,000
Held-to-maturity securities	7,125,000	5,119,000
Equity securities	300,000	218,000
Loans held for sale	4,693,000	1,924,000
Loans net of allowance for credit losses	3,839,827,000	3,056,344,000
Interest receivable	20,218,000	19,287,000
Federal Reserve Bank stock	9,401,000	9,401,000
Federal Home Loan Bank stock	5,450,000	5,450,000
Financial Liabilities
Deposits	4,740,802,000	3,697,105,000
Securities sold under agreements to repurchase	212,514,000	206,945,000
Interest payable	3,214,000	2,345,000
Federal Home Loan Bank borrowings	117,670,000	96,669,000
Fair Value \| Subordinated Debt
Financial Liabilities
Subordinated debt, net	94,289,000	94,253,000
Fair Value \| Junior Subordinated Debentures
Financial Liabilities
Subordinated debt, net	$ 14,495,000	$ 14,604,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty.

No definition available.