Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024		Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans	[1]			$ 5,134,388	$ 5,137,838
Mortgage loans held for sale, at lower of cost or market				0	281,706
Related allowance on collateral dependent individually analyzed loans				37,236	41,960
Charge-off				14,735	2,413		$ 577
TLM, carrying value				7,915	15,828
Proceeds from sales of loans, net				465,470	408,844		219,568
Combination
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TLM, carrying value	[2]				6,713
Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans				7,508	11,591
Related allowance on collateral dependent individually analyzed loans				0	1,511
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale, at lower of cost or market					281,706
Total assets at fair value				0	290,763
Nonrecurring | Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans					9,057
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale, at lower of cost or market					0
Total assets at fair value					0
Nonrecurring | Level 1 | Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans					0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale, at lower of cost or market					281,706
Total assets at fair value					281,706
Nonrecurring | Level 2 | Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans					0
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale, at lower of cost or market					0
Total assets at fair value					9,057
Nonrecurring | Level 3 | Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans					9,057
Commercial & industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans	[3]			564,082	542,474
Related allowance on collateral dependent individually analyzed loans				9,750	7,277		8,088	$ 10,356
Charge-off				8,693	208		37
TLM, carrying value				0	5,515
Commercial & industrial | Combination
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TLM, carrying value	[2]				0
Commercial & industrial | Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans	[4]			0	515
Related allowance on collateral dependent individually analyzed loans	[4]			0	259
Commercial & industrial | Nonrecurring | Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans			$ 9,300	1,000
Related allowance on collateral dependent individually analyzed loans			2,300
Charge-off		$ 8,300
Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans	[5]			2,183,985	2,154,504
Related allowance on collateral dependent individually analyzed loans				19,766	26,485		24,144	$ 18,435
Charge-off				5,715	1,961		$ 373
TLM, carrying value				5,605	10,053
Commercial real estate | Combination
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Charge-off		3,000
TLM, carrying value			$ 4,300		6,713	[2]
Proceeds from sales of loans, net		$ 1,200
Commercial real estate | Collateral Dependent Individually Analyzed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent individually analyzed loans	[6]			5,605	10,053
Related allowance on collateral dependent individually analyzed loans	[6]			$ 0	$ 1,252

[1] Includes net unamortized loan origination costs of $11.0 million and $10.9 million, respectively, at December 31, 2025 and 2024 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $198 thousand and $242 thousand, respectively, at December 31, 2025 and 2024.

[2] Combination includes an interest rate reduction, payment deferral and maturity extension.

[3] C&I consists of loans to businesses and individuals, a portion of which are fully or partially collateralized by real estate.

[4] Secured by business assets.

[5] CRE consists of commercial mortgages primarily secured by non-owner occupied income-producing property, as well as construction and development loans. Construction and development loans are made to businesses for land development or the on-site construction of industrial, commercial, or residential buildings.

[6] Secured by income-producing property.