Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financial Assets:
Interest Bearing Time Deposits with Banks	$ 500	$ 500
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,313,557)	(5,252,963)
Time Deposits	(880,519)	(767,042)
Carrying Value
Financial Assets:
Cash and Short-term Investments	329,319	115,330
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	3,984,764	3,918,184
Accrued Interest Receivable	28,102	30,595
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,433,038)	(4,485,921)
Time Deposits	(880,519)	(767,042)
Short-term Borrowings	(38,521)	(65,968)
Long-term Debt	(128,123)	(127,969)
Accrued Interest Payable	(9,518)	(7,073)
Estimate of Fair Value Measurement
Financial Assets:
Cash and Short-term Investments	329,319	115,330
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	3,887,966	3,801,738
Accrued Interest Receivable	28,102	30,595
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,433,038)	(4,485,921)
Time Deposits	(872,592)	(759,217)
Short-term Borrowings	(38,521)	(65,968)
Long-term Debt	(124,001)	(127,084)
Accrued Interest Payable	(9,518)	(7,073)
Estimate of Fair Value Measurement | Level 1
Financial Assets:
Cash and Short-term Investments	70,418	78,805
Interest Bearing Time Deposits with Banks	0	0
Loans, Net	0	0
Accrued Interest Receivable	0	0
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,433,038)	(4,485,921)
Time Deposits	0	0
Short-term Borrowings	0	(25,000)
Long-term Debt	0	0
Accrued Interest Payable	0	0
Estimate of Fair Value Measurement | Level 2
Financial Assets:
Cash and Short-term Investments	258,901	36,525
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	0	0
Accrued Interest Receivable	7,944	10,014
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(872,592)	(759,217)
Short-term Borrowings	(38,521)	(40,968)
Long-term Debt	(52,606)	(52,522)
Accrued Interest Payable	(9,049)	(6,701)
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	3,887,966	3,801,738
Accrued Interest Receivable	20,158	20,581
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(71,395)	(74,562)
Accrued Interest Payable	$ (469)	$ (372)