Fair Value Measurements - Carrying Amounts and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financial assets
Securities held to maturity	$ 1,002,544	$ 1,121,830
Securities available for sale	831,013	923,279
Loans held for sale	246,171	179,756
Mortgage servicing rights	72,991	91,688	$ 84,448
Derivative instruments	34,505	29,284
Financial liabilities
Derivative instruments	28,550	26,425
Carrying Value
Financial assets
Cash and cash equivalents	1,092,032	801,351
Securities held to maturity	1,126,112	1,221,464
Securities available for sale	831,013	923,279
Loans held for sale	246,171	179,756
Loans, net	12,683,264	12,152,652
Mortgage servicing rights	72,991	91,688
Derivative instruments	38,954	37,151
Financial liabilities
Deposits	14,572,612	14,076,785
Short-term borrowings	108,018	307,577
Junior subordinated debentures	113,916	112,978
Subordinated notes	316,698	316,422
Derivative instruments	32,268	33,608
Fair Value
Financial assets
Cash and cash equivalents	1,092,032	801,351
Securities held to maturity	1,002,544	1,121,830
Securities available for sale	831,013	923,279
Loans held for sale	246,171	179,756
Loans, net	12,340,638	11,594,363
Mortgage servicing rights	96,290	117,664
Derivative instruments	38,954	37,151
Financial liabilities
Deposits	14,570,304	14,060,050
Short-term borrowings	108,018	307,577
Junior subordinated debentures	100,668	96,435
Subordinated notes	295,868	255,192
Derivative instruments	32,268	33,608
Fair Value | Level 1
Financial assets
Cash and cash equivalents	1,092,032	801,351
Securities held to maturity	0	0
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net	0	0
Mortgage servicing rights	0	0
Derivative instruments	0	0
Financial liabilities
Deposits	12,093,327	11,381,556
Short-term borrowings	108,018	307,577
Junior subordinated debentures	0	0
Subordinated notes	0	0
Derivative instruments	0	0
Fair Value | Level 2
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	1,002,544	1,121,830
Securities available for sale	831,013	923,279
Loans held for sale	246,171	179,756
Loans, net	0	0
Mortgage servicing rights	0	0
Derivative instruments	38,954	37,151
Financial liabilities
Deposits	2,476,977	2,678,494
Short-term borrowings	0	0
Junior subordinated debentures	100,668	96,435
Subordinated notes	295,868	255,192
Derivative instruments	32,268	33,608
Fair Value | Level 3
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net	12,340,638	11,594,363
Mortgage servicing rights	96,290	117,664
Derivative instruments	0	0
Financial liabilities
Deposits	0	0
Short-term borrowings	0	0
Junior subordinated debentures	0	0
Subordinated notes	0	0
Derivative instruments	$ 0	$ 0