Fair Value Measurement - Summary of Estimated Fair Values of Financial Instruments and Levels Within Fair Value Hierarchy (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Financial assets
Cash and due from banks	$ 45,233,000	$ 48,228,000
Interest bearing deposits with other banks	74,386,000	32,509,000
Securities held-to-maturity, fair value	4,516,000	4,498,000
Restricted stock, at cost	24,197,000	22,127,000
Loans held for sale	13,299,000	11,732,000
Loans and lease receivables, net (less impaired loans at fair value)	3,818,419,000	3,753,725,000
Financial liabilities
Federal Reserve Bank discount window borrowing	250,000,000	0
Federal Home Loan Bank advances	335,000,000	490,000,000
Securities sold under agreements to repurchase	55,647,000	49,638,000
Junior subordinated debentures issued to capital trusts, net	37,462,000	37,334,000
Level 1 | Carrying Amount
Financial assets
Cash and due from banks	45,233,000	48,228,000
Level 1 | Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	45,233,000	48,228,000
Level 2 | Carrying Amount
Financial assets
Interest bearing deposits with other banks	74,386,000	32,509,000
Securities held-to-maturity, fair value	4,408,000	4,412,000
Restricted stock, at cost	24,197,000	22,127,000
Financial liabilities
Non-interest-bearing deposits	1,290,896,000	1,279,641,000
Interest-bearing deposits	2,947,940,000	2,867,936,000
Accrued interest payable	2,104,000	3,677,000
Federal Reserve Bank discount window borrowing	250,000,000
Federal Home Loan Bank advances	335,000,000	490,000,000
Securities sold under agreements to repurchase	55,647,000	49,638,000
Level 2 | Estimate of Fair Value Measurement
Financial assets
Interest bearing deposits with other banks	74,386,000	32,509,000
Securities held-to-maturity, fair value	4,516,000	4,498,000
Restricted stock, at cost	24,197,000	22,127,000
Financial liabilities
Non-interest-bearing deposits	1,290,896,000	1,279,641,000
Interest-bearing deposits	2,951,430,000	2,873,380,000
Accrued interest payable	2,104,000	3,677,000
Federal Reserve Bank discount window borrowing	250,000,000
Federal Home Loan Bank advances	335,000,000	490,000,000
Securities sold under agreements to repurchase	55,647,000	49,638,000
Level 3 | Carrying Amount
Financial assets
Loans held for sale	13,299,000	11,732,000
Loans and lease receivables, net (less impaired loans at fair value)	3,750,417,000	3,695,674,000
Accrued interest receivable	13,064,000	13,283,000
Financial liabilities
Junior subordinated debentures issued to capital trusts, net	37,462,000	37,334,000
Level 3 | Estimate of Fair Value Measurement
Financial assets
Loans held for sale	13,580,000	12,935,000
Loans and lease receivables, net (less impaired loans at fair value)	3,653,649,000	3,661,724,000
Accrued interest receivable	13,064,000	13,283,000
Financial liabilities
Junior subordinated debentures issued to capital trusts, net	$ 41,469,000	$ 42,881,000