Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial Assets:
Interest Bearing Time Deposits with Banks	$ 995	$ 745
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,713,608)	(4,744,316)
Time Deposits	(464,752)	(347,099)
Carrying Value
Financial Assets:
Cash and Short-term Investments	526,045	396,890
Interest Bearing Time Deposits with Banks	995	745
Loans, Net	3,572,796	2,960,728
Accrued Interest Receivable	21,946	20,229
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,248,856)	(4,397,217)
Time Deposits	(464,752)	(347,099)
Short-term Borrowings	(42,410)	(68,328)
Long-term Debt	(102,475)	(83,855)
Accrued Interest Payable	(818)	(613)
Estimate of Fair Value Measurement
Financial Assets:
Cash and Short-term Investments	526,045	396,890
Interest Bearing Time Deposits with Banks	995	745
Loans, Net	3,564,134	2,980,555
Accrued Interest Receivable	21,946	20,229
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(5,248,856)	(4,397,217)
Time Deposits	(465,042)	(347,876)
Short-term Borrowings	(42,410)	(68,328)
Long-term Debt	(98,403)	(86,623)
Accrued Interest Payable	(818)	(613)
Estimate of Fair Value Measurement | Level 1
Financial Assets:
Cash and Short-term Investments	111,904	47,173
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	(5,248,856)	(4,397,217)
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	0	0
Accrued Interest Payable	0	0
Estimate of Fair Value Measurement | Level 2
Financial Assets:
Cash and Short-term Investments	414,141	349,717
Interest Bearing Time Deposits with Banks	995	745
Loans, Net	0	0
Accrued Interest Receivable	10,675	9,213
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(465,042)	(347,876)
Short-term Borrowings	(42,410)	(68,328)
Long-term Debt	(27,234)	(28,320)
Accrued Interest Payable	(671)	(579)
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	3,564,134	2,980,555
Accrued Interest Receivable	11,271	11,016
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(71,169)	(58,303)
Accrued Interest Payable	$ (147)	$ (34)