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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

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