Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial Assets:
Securities Purchased Under Agreements to Resell	$ 25,879	$ 0
Securities	916,091	879,571
Other Equity Securities	39,555	33,942
Carrying Amount
Financial Assets:
Cash and Short-Term Investments	383,179	377,244
Securities Purchased Under Agreements to Resell	25,879
Securities	916,091	879,571
Loans Held for Sale	0	835
Loans - Net	5,177,964	4,952,371
Cash Value of BOLI	101,362	96,478
Other Equity Securities	39,555	33,942
Total	6,644,030	6,340,441
Financial Liabilities:
Deposits	5,640,946	5,248,790
Borrowings	493,549	635,073
Total	6,134,495	5,883,863
Total Fair Value
Financial Assets:
Cash and Short-Term Investments	383,179	377,244
Securities Purchased Under Agreements to Resell	25,879
Securities	916,091	879,571
Loans Held for Sale	0	835
Loans - Net	5,122,452	4,849,503
Cash Value of BOLI	101,362	96,478
Other Equity Securities	39,555	33,942
Total	6,588,518	6,237,573
Financial Liabilities:
Deposits	5,640,442	5,243,326
Borrowings	480,092	613,464
Total	6,120,534	5,856,790
Total Fair Value | Level 1
Financial Assets:
Cash and Short-Term Investments	383,179	377,244
Securities Purchased Under Agreements to Resell	0
Securities	0	0
Loans Held for Sale	0	0
Loans - Net	0	0
Cash Value of BOLI	0	0
Other Equity Securities	0	0
Total	383,179	377,244
Financial Liabilities:
Deposits	0	0
Borrowings	0	0
Total	0	0
Total Fair Value | Level 2
Financial Assets:
Cash and Short-Term Investments	0	0
Securities Purchased Under Agreements to Resell	25,879
Securities	882,424	850,756
Loans Held for Sale	0	835
Loans - Net	0	0
Cash Value of BOLI	101,362	96,478
Other Equity Securities	0	0
Total	1,009,665	948,069
Financial Liabilities:
Deposits	0	0
Borrowings	480,092	613,464
Total	480,092	613,464
Total Fair Value | Level 3
Financial Assets:
Cash and Short-Term Investments	0	0
Securities Purchased Under Agreements to Resell	0
Securities	33,667	28,815
Loans Held for Sale	0	0
Loans - Net	5,122,452	4,849,503
Cash Value of BOLI	0	0
Other Equity Securities	39,555	33,942
Total	5,195,674	4,912,260
Financial Liabilities:
Deposits	5,640,442	5,243,326
Borrowings	0	0
Total	$ 5,640,442	$ 5,243,326