Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Securities	$ 998,708	$ 1,002,778
Portfolio loans, net	7,142,951	7,082,629
Derivative financial assets	67,403	83,456
LIABILITIES
Junior subordinated debt securities	54,468	54,453
Derivative financial liabilities	82,685	104,817
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	244,152	210,009
Securities	998,708	1,002,778
Loans held for sale	81	16
Portfolio loans, net	7,142,951	7,082,629
Collateral receivable	4,901	6,307
Securities held in a deferred compensation plan	7,790	8,087
Mortgage servicing rights	6,935	7,147
LIABILITIES
Deposits	7,153,094	7,219,970
Collateral payable	55,301	65,065
Short-term borrowings	495,000	370,000
Long-term borrowings	14,628	14,741
Junior subordinated debt securities	54,468	54,453
Carrying Value | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	67,397
LIABILITIES
Derivative financial liabilities	67,397	83,449
Carrying Value | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	15,288	21,368
Carrying Value | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		83,449
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets	6	5
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets		2
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	244,152	210,009
Securities	998,708	1,002,778
Loans held for sale	81	16
Portfolio loans, net	6,883,297	6,815,167
Collateral receivable	4,901	6,307
Securities held in a deferred compensation plan	7,790	8,087
Mortgage servicing rights	9,335	9,994
LIABILITIES
Deposits	7,132,944	7,194,225
Collateral payable	55,301	65,065
Short-term borrowings	495,000	370,000
Long-term borrowings	14,162	14,174
Junior subordinated debt securities	54,468	54,453
Fair Value Measurements | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	67,397
LIABILITIES
Derivative financial liabilities	67,397	83,449
Fair Value Measurements | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	15,288	21,368
Fair Value Measurements | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		83,449
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets	6	5
Fair Value Measurements | Forward sale contracts
ASSETS
Derivative financial assets		2
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits	244,152	210,009
Securities	134,657	132,647
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable	4,901	6,307
Securities held in a deferred compensation plan	7,790	8,087
Mortgage servicing rights	0	0
LIABILITIES
Deposits	5,977,856	6,285,377
Collateral payable	55,301	65,065
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated debt securities	0	0
Fair Value Measurements | Level 1 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 1 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	0	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
ASSETS
Derivative financial assets	0	0
Fair Value Measurements | Level 1 | Forward sale contracts
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities	864,051	870,131
Loans held for sale	81	16
Portfolio loans, net	0	0
Collateral receivable	0	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	0	0
LIABILITIES
Deposits	1,155,088	908,848
Collateral payable	0	0
Short-term borrowings	495,000	370,000
Long-term borrowings	14,162	14,174
Junior subordinated debt securities	54,468	54,453
Fair Value Measurements | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	67,397
LIABILITIES
Derivative financial liabilities	67,397	83,449
Fair Value Measurements | Level 2 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	15,288	21,368
Fair Value Measurements | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		83,449
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities		0
Loans held for sale	0	0
Portfolio loans, net	6,883,297	6,815,167
Collateral receivable	0	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	9,335	9,994
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 swaps - commercial loans
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 3 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 3 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets	$ 6	5
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets		$ 2