Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from Contracts with Customers
Net interest income	$ 159,939	$ 145,147	$ 327,186	$ 279,019
Not in scope of Topic 606	5,695	1,541	11,853	1,612
Total noninterest income	47,348	44,137	96,371	85,517
Total revenue	207,287	189,284	423,557	364,536
Retail Banking
Revenue from Contracts with Customers
Net interest income	104,237	107,368	213,157	201,416
Not in scope of Topic 606	1,754	1,160	3,455	2,252
Total noninterest income	23,797	22,485	48,064	45,800
Total revenue	128,034	129,853	261,221	247,216
Commercial Banking
Revenue from Contracts with Customers
Net interest income	41,496	36,826	82,435	71,914
Not in scope of Topic 606	1,827	1,469	2,939	3,387
Total noninterest income	19,086	20,415	36,974	39,070
Total revenue	60,582	57,241	119,409	110,984
Treasury and Other
Revenue from Contracts with Customers
Net interest income	14,206	953	31,594	5,689
Not in scope of Topic 606	2,114	(1,088)	5,459	(4,027)
Total noninterest income	4,465	1,237	11,333	647
Total revenue	18,671	2,190	42,927	6,336
Service charges on deposit accounts.
Revenue from Contracts with Customers
Revenue by type of service	7,246	6,843	14,477	14,344
Service charges on deposit accounts. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,458	6,085	13,000	12,734
Service charges on deposit accounts. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	662	413	1,288	759
Service charges on deposit accounts. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	126	345	189	851
Credit and debit card fees
Revenue from Contracts with Customers
Revenue by type of service	14,878	16,449	30,589	30,691
Credit and debit card fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	13,639	15,243	28,053	28,269
Credit and debit card fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	1,239	1,206	2,536	2,422
Other service charges and fees.
Revenue from Contracts with Customers
Revenue by type of service	7,023	7,210	14,127	14,923
Other service charges and fees. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,049	6,306	12,220	12,869
Other service charges and fees. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	424	417	844	1,198
Other service charges and fees. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	550	487	1,063	856
Trust and investment services income
Revenue from Contracts with Customers
Revenue by type of service	9,448	8,759	19,062	17,642
Trust and investment services income | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	9,448	8,759	19,062	17,642
Other.
Revenue from Contracts with Customers
Revenue by type of service	3,058	3,335	6,263	6,305
Other. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	88	175	327	303
Other. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	2,534	2,873	3,850	5,457
Other. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ 436	$ 287	$ 2,086	$ 545