Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
ASSETS
Securities available for sale	$ 970,372	$ 1,002,778
Portfolio loans, net	7,213,854	7,082,629
Derivative financial assets	81,968	83,456
LIABILITIES
Junior subordinated debt securities	54,483	54,453
Derivative financial liabilities	105,563	104,817
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	227,867	210,009
Securities available for sale	970,372	1,002,778
Loans held for sale	541	16
Portfolio loans, net	7,213,854	7,082,629
Collateral receivable	8,761	6,307
Securities held in a deferred compensation plan	8,625	8,087
Mortgage servicing rights	6,731	7,147
LIABILITIES
Deposits	7,141,210	7,219,970
Collateral payable	62,449	65,065
Short-term borrowings	530,000	370,000
Long-term borrowings	39,513	14,741
Junior subordinated debt securities	54,483	54,453
Carrying Value | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	81,968
LIABILITIES
Derivative financial liabilities	81,968	83,449
Carrying Value | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	23,595	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		5
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets		2
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	227,867	210,009
Securities available for sale	970,372	1,002,778
Loans held for sale	541	16
Portfolio loans, net	6,888,525	6,815,167
Collateral receivable	8,761	6,307
Securities held in a deferred compensation plan	8,625	8,087
Mortgage servicing rights	9,506	9,994
LIABILITIES
Deposits	7,120,051	7,194,225
Collateral payable	62,449	65,065
Short-term borrowings	530,000	370,000
Long-term borrowings	38,985	14,174
Junior subordinated debt securities	54,483	54,453
Fair Value Measurements | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	81,968
LIABILITIES
Derivative financial liabilities	81,968	83,449
Fair Value Measurements | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	23,595	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		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	227,867	210,009
Securities available for sale	132,134	132,647
Loans held for sale	0	0
Portfolio loans, net		0
Collateral receivable	8,761	6,307
Securities held in a deferred compensation plan	8,625	8,087
Mortgage servicing rights	0	0
LIABILITIES
Deposits	5,808,064	6,285,377
Collateral payable	62,449	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
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 available for sale	838,238	870,131
Loans held for sale	541	16
Portfolio loans, net		0
Collateral receivable	0	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	0	0
LIABILITIES
Deposits	1,311,987	908,848
Collateral payable	0	0
Short-term borrowings	530,000	370,000
Long-term borrowings	38,985	14,174
Junior subordinated debt securities	54,483	54,453
Fair Value Measurements | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	81,968
LIABILITIES
Derivative financial liabilities	81,968	83,449
Fair Value Measurements | Level 2 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	23,595	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
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 available for sale		0
Loans held for sale	0	0
Portfolio loans, net	6,888,525	6,815,167
Collateral receivable	0	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	9,506	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		5
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets		$ 2