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Fair Value Measurements - Carrying Amounts and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair values of defined benefit pension plan assets by category of the firm
Securities available for sale, at fair value	$ 1,343,457	$ 1,290,613
Loans held for sale	417,771	318,272
Loans, net	10,757,503	9,637,476
Mortgage servicing rights	62,994	53,208	$ 48,230
Derivative instruments	3,866	61
Financial liabilities
Derivative instruments	21,107	9,974
Carrying Value
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	633,203	414,930
Securities available for sale, at fair value	1,343,457	1,290,613
Loans held for sale	417,771	318,272
Loans, net	10,757,503	9,637,476
Mortgage servicing rights	62,994	53,208
Derivative instruments	33,574	8,498
Financial liabilities
Deposits	12,059,081	10,213,168
Short-term borrowings	21,340	489,091
Federal Home Loan Bank advances	152,167	152,337
Junior subordinated debentures	110,794	110,215
Subordinated notes	212,009	113,955
Derivative instruments	21,107	10,000
Fair Value
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	633,203	414,930
Securities available for sale, at fair value	1,343,457	1,290,613
Loans held for sale	417,771	318,272
Loans, net	10,668,625	9,321,039
Mortgage servicing rights	62,994	53,208
Derivative instruments	33,574	8,498
Financial liabilities
Deposits	12,069,198	10,210,967
Short-term borrowings	21,340	489,091
Federal Home Loan Bank advances	158,914	152,321
Junior subordinated debentures	93,092	104,480
Subordinated notes	217,575	117,963
Derivative instruments	21,107	10,000
Fair Value | Level 1
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	633,203	414,930
Securities available for sale, at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Mortgage servicing rights	0	0
Derivative instruments	0	0
Financial liabilities
Deposits	10,363,193	8,052,536
Short-term borrowings	21,340	489,091
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Subordinated notes	0	0
Derivative instruments	0	0
Fair Value | Level 2
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	0	0
Securities available for sale, at fair value	1,334,445	1,280,627
Loans held for sale	417,771	318,272
Loans, net	0	0
Mortgage servicing rights	0	0
Derivative instruments	33,574	8,498
Financial liabilities
Deposits	1,706,005	2,158,431
Short-term borrowings	0	0
Federal Home Loan Bank advances	158,914	152,321
Junior subordinated debentures	93,092	104,480
Subordinated notes	217,575	117,963
Derivative instruments	21,107	10,000
Fair Value | Level 3
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	0	0
Securities available for sale, at fair value	9,012	9,986
Loans held for sale	0	0
Loans, net	10,668,625	9,321,039
Mortgage servicing rights	62,994	53,208
Derivative instruments	0	0
Financial liabilities
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Subordinated notes	0	0
Derivative instruments	$ 0	$ 0

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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