Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financial Assets:
Interest Bearing Time Deposits with Banks	$ 500	$ 500
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,179,705)	(5,350,051)
Time Deposits	(582,745)	(428,469)
Carrying Value
Financial Assets:
Cash and Short-term Investments	140,671	119,079
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	3,768,977	3,724,804
Accrued Interest Receivable	25,996	27,741
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,596,960)	(4,921,582)
Time Deposits	(582,745)	(428,469)
Short-term Borrowings	(99,674)	(101,161)
Long-term Debt	(127,810)	(102,645)
Accrued Interest Payable	(3,896)	(1,513)
Estimate of Fair Value Measurement
Financial Assets:
Cash and Short-term Investments	140,671	119,079
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	3,691,120	3,688,903
Accrued Interest Receivable	25,996	27,741
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,596,960)	(4,921,582)
Time Deposits	(578,094)	(426,184)
Short-term Borrowings	(99,674)	(101,161)
Long-term Debt	(123,871)	(99,102)
Accrued Interest Payable	(3,896)	(1,513)
Estimate of Fair Value Measurement | Level 1
Financial Assets:
Cash and Short-term Investments	78,223	77,174
Interest Bearing Time Deposits with Banks	0	0
Loans, Net	0	0
Accrued Interest Receivable	0	38
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,596,960)	(4,921,582)
Time Deposits	0	0
Short-term Borrowings	(47,800)	(36,200)
Long-term Debt	0	0
Accrued Interest Payable	0	0
Estimate of Fair Value Measurement | Level 2
Financial Assets:
Cash and Short-term Investments	62,448	41,905
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	0	0
Accrued Interest Receivable	10,143	10,863
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(578,094)	(426,184)
Short-term Borrowings	(51,874)	(64,961)
Long-term Debt	(51,978)	(26,830)
Accrued Interest Payable	(3,534)	(1,205)
Estimate of Fair Value Measurement | Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Interest Bearing Time Deposits with Banks	0	0
Loans, Net	3,691,120	3,688,903
Accrued Interest Receivable	15,853	16,840
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(71,893)	(72,272)
Accrued Interest Payable	$ (362)	$ (308)