Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
ASSETS
Securities available for sale	$ 1,013,305	$ 987,659
Portfolio loans, net	7,965,066	7,978,779
Derivative financial assets	35,056	33,750
LIABILITIES
Junior subordinated debt securities	49,508	49,478
Derivative financial liabilities	36,716	36,014
Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	34,965	33,669
LIABILITIES
Derivative financial liabilities	36,716	36,014
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	217,819	163,436
Securities available for sale	1,013,305	987,659
Loans held for sale	4,695	1,010
Portfolio loans, net	7,965,066	7,978,779
Collateral receivable		2
Securities held in a deferred compensation plan	12,152	14,212
Mortgage servicing rights	4,860	5,034
LIABILITIES
Deposits	8,086,083	7,958,831
Collateral payable	31,837	26,964
Short-term borrowings	200,000	165,000
Long-term borrowings	25,773	50,815
Junior subordinated debt securities	49,508	49,478
Carrying Value \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets		81
Carrying Value \| Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		33,669
Carrying Value \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	91
Carrying Value \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	34,965
LIABILITIES
Derivative financial liabilities	35,194	33,990
Carrying Value \| Interest rate swap contracts - cash flow hedge
LIABILITIES
Derivative financial liabilities	1,522	2,024
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	217,819	163,436
Securities available for sale	1,013,305	987,659
Loans held for sale	4,695	1,010
Portfolio loans, net	7,786,180	7,807,824
Collateral receivable		2
Securities held in a deferred compensation plan	12,152	14,212
Mortgage servicing rights	7,989	8,034
LIABILITIES
Deposits	8,079,694	7,956,632
Collateral payable	31,837	26,964
Short-term borrowings	200,000	165,000
Long-term borrowings	25,768	50,856
Junior subordinated debt securities	49,508	49,478
Fair Value Measurements \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets		81
Fair Value Measurements \| Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		33,669
Fair Value Measurements \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	91
Fair Value Measurements \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	34,965
LIABILITIES
Derivative financial liabilities	35,194	33,990
Fair Value Measurements \| Interest rate swap contracts - cash flow hedge
LIABILITIES
Derivative financial liabilities	1,522	2,024
Fair Value Measurements \| Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits	217,819	163,436
Securities available for sale	57,206	85,889
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable		2
Securities held in a deferred compensation plan	12,152	14,212
Mortgage servicing rights	0	0
LIABILITIES
Deposits	6,091,941	6,010,039
Collateral payable	31,837	26,964
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated debt securities	0	0
Fair Value Measurements \| Level 1 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets		0
Fair Value Measurements \| Level 1 \| Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		0
Fair Value Measurements \| Level 1 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	0
Fair Value Measurements \| Level 1 \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements \| Level 1 \| Interest rate swap contracts - cash flow hedge
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements \| Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities available for sale	956,099	901,770
Loans held for sale	4,695	1,010
Portfolio loans, net	0	0
Collateral receivable		0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	0	0
LIABILITIES
Deposits	1,987,753	1,946,593
Collateral payable	0	0
Short-term borrowings	200,000	165,000
Long-term borrowings	25,768	50,856
Junior subordinated debt securities	49,508	49,478
Fair Value Measurements \| Level 2 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets		0
Fair Value Measurements \| Level 2 \| Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		33,669
Fair Value Measurements \| Level 2 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	0
Fair Value Measurements \| Level 2 \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	34,965
LIABILITIES
Derivative financial liabilities	35,194	33,990
Fair Value Measurements \| Level 2 \| Interest rate swap contracts - cash flow hedge
LIABILITIES
Derivative financial liabilities	1,522	2,024
Fair Value Measurements \| Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities available for sale	0	0
Loans held for sale	0
Portfolio loans, net	7,786,180	7,807,824
Collateral receivable		0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	7,989	8,034
LIABILITIES
Deposits	0	0
Collateral payable	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated debt securities	0	0
Fair Value Measurements \| Level 3 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets		81
Fair Value Measurements \| Level 3 \| Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		0
Fair Value Measurements \| Level 3 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	91
Fair Value Measurements \| Level 3 \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements \| Level 3 \| Interest rate swap contracts - cash flow hedge
LIABILITIES
Derivative financial liabilities	$ 0	$ 0

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