Fair Value - Schedule of Fair Value of Assets Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025
Financial Assets
Debt securities AFS	$ 4,634,355		$ 5,164,567
MSR	29,398	$ 26,784	28,061
Fair Value, Measurements, Recurring
Financial Assets
Derivative financial instruments	49,937		28,620
Loans held for sale	14,462		16,297
Equity securities	13,255		13,923
MSR	29,398		28,061
Financial Liabilities
Derivative financial instruments	40,003		25,483
Fair Value, Measurements, Nonrecurring
Financial Assets
OREO	3,263		4,250
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Debt securities AFS	100		200
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Financial Assets
Derivative financial instruments	0		0
Loans held for sale	0		0
Equity securities	13,255		13,923
MSR	0		0
Financial Liabilities
Derivative financial instruments	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring
Financial Assets
OREO	0		0
Significant Other Observable Inputs (Level 2)
Financial Assets
Debt securities AFS	4,634,255		5,164,367
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Financial Assets
Derivative financial instruments	49,937		28,125
Loans held for sale	14,462		16,297
Equity securities	0		0
MSR	0		0
Financial Liabilities
Derivative financial instruments	39,850		25,389
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Financial Assets
OREO	0		0
Significant Unobservable Inputs (Level 3)
Financial Assets
Debt securities AFS	0		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Financial Assets
Derivative financial instruments	0		495
Loans held for sale	0		0
Equity securities	0		0
MSR	29,398		28,061
Financial Liabilities
Derivative financial instruments	153		94
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Financial Assets
OREO	$ 3,263		$ 4,250