Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Securities	$ 910,793	$ 773,693
Loans held for sale	1,522	18,528
LIABILITIES
Junior subordinated debt securities	54,393	64,083	$ 64,277
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	922,215	229,666
Securities	910,793	773,693
Loans held for sale	1,522	18,528
Portfolio loans, net	6,901,414	7,108,248
Collateral receivable	37,363
Securities held in a deferred compensation plan	10,230	77,936
Mortgage servicing rights	7,677	6,794
LIABILITIES
Deposits	7,996,524	7,420,538
Securities sold under repurchase agreements	84,491	65,163
Short-term borrowings	0	75,000
Long-term borrowings	22,430	23,681
Junior subordinated debt securities	54,393	64,083
Carrying Value | Interest rate swaps
ASSETS
Derivative financial assets	33,528	4,976
LIABILITIES
Derivative financial liabilities	33,631	79,033
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets	401	78,319
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets	4	2,900
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	922,215	229,666
Securities	910,793	773,693
Loans held for sale	1,522	18,528
Portfolio loans, net	6,815,468	7,028,446
Collateral receivable	37,363
Securities held in a deferred compensation plan	10,230	77,936
Mortgage servicing rights	7,677	6,794
LIABILITIES
Deposits	7,992,942	7,422,894
Securities sold under repurchase agreements	84,491	65,163
Short-term borrowings	0	75,000
Long-term borrowings	22,678	24,545
Junior subordinated debt securities	54,393	64,083
Fair Value Measurements | Interest rate swaps
ASSETS
Derivative financial assets	33,528	4,976
LIABILITIES
Derivative financial liabilities	33,631	79,033
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets	401	78,319
Fair Value Measurements | Forward sale contracts
ASSETS
Derivative financial assets	4	2,900
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits	922,215	229,666
Securities	96,388	13,510
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable	37,363
Securities held in a deferred compensation plan	10,230	77,936
Mortgage servicing rights	0	6,794
LIABILITIES
Deposits	6,908,453	6,033,075
Securities sold under repurchase agreements	84,491	65,163
Short-term borrowings	0	75,000
Long-term borrowings	4,300	4,494
Junior subordinated debt securities	54,393	64,083
Fair Value Measurements | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	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	0
LIABILITIES
Derivative financial liabilities		0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities	814,405	760,183
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	0	0
LIABILITIES
Deposits	1,084,489	1,389,819
Securities sold under repurchase agreements	0	0
Short-term borrowings	0	0
Long-term borrowings	18,378	20,051
Junior subordinated debt securities	0	0
Fair Value Measurements | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets	33,528	0
LIABILITIES
Derivative financial liabilities	33,631	79,033
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	78,319
Fair Value Measurements | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities	0	0
Loans held for sale	1,522	18,528
Portfolio loans, net	6,815,468	7,028,446
Collateral receivable	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	7,677	0
LIABILITIES
Deposits	0	0
Securities sold under repurchase agreements	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
ASSETS
Derivative financial assets	0	4,976
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets	401	0
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets	$ 4	2,900
LIABILITIES
Derivative financial liabilities		$ 0