Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial Assets:
Interest Bearing Time Deposits with Banks	$ 500	$ 500
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,271,279)	(5,252,963)
Time Deposits	(909,568)	(767,042)
Carrying Value
Financial Assets:
Cash and Short-term Investments	195,555	115,330
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	4,010,050	3,918,184
Accrued Interest Receivable	29,101	30,595
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,361,711)	(4,485,921)
Time Deposits	(909,568)	(767,042)
Short-term Borrowings	(50,956)	(65,968)
Long-term Debt	(153,197)	(127,969)
Accrued Interest Payable	(8,275)	(7,073)
Estimate of Fair Value Measurement
Financial Assets:
Cash and Short-term Investments	195,555	115,330
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	3,919,756	3,801,738
Accrued Interest Receivable	29,101	30,595
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,361,711)	(4,485,921)
Time Deposits	(903,306)	(759,217)
Short-term Borrowings	(50,956)	(65,968)
Long-term Debt	(153,194)	(127,084)
Accrued Interest Payable	(8,275)	(7,073)
Estimate of Fair Value Measurement | Level 1
Financial Assets:
Cash and Short-term Investments	77,652	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	(4,361,711)	(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	117,903	36,525
Interest Bearing Time Deposits with Banks	500	500
Loans, Net	0	0
Accrued Interest Receivable	7,354	10,014
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(903,306)	(759,217)
Short-term Borrowings	(50,956)	(40,968)
Long-term Debt	(78,696)	(52,522)
Accrued Interest Payable	(7,904)	(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	3,919,756	3,801,738
Accrued Interest Receivable	21,747	20,581
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(74,498)	(74,562)
Accrued Interest Payable	$ (371)	$ (372)