Goodwill and Other Intangibles (Tables)

3 Months Ended

Mar. 31, 2025

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

Changes in the carrying amount of goodwill for the periods ended March 31, 2025 and December 31, 2024 by reportable segment are as follows (in thousands):

	Commercial Banking		Institutional Banking		Personal Banking		Total
Balances as of January 1, 2025	$	63,113	$	76,492	$	67,780	$	207,385
Acquisition of HTLF		954,640		—		636,426		1,591,066
Balances as of March 31, 2025	$	1,017,753	$	76,492	$	704,206	$	1,798,451
Balances as of January 1, 2024	$	63,113	$	76,492	$	67,780	$	207,385
Balances as of December 31, 2024	$	63,113	$	76,492	$	67,780	$	207,385

Changes in Intangible Assets

The following are the finite-lived intangible assets that continue to be subject to amortization as of March 31, 2025 and December 31, 2024 (in thousands):

	As of March 31, 2025
	Core Deposit Intangible Assets		Customer Relationships		Total
Gross carrying amount	$	476,445	$	123,721	$	600,166
Accumulated amortization		16,055		26,925		42,980
Net carrying amount	$	460,390	$	96,796	$	557,186

	As of December 31, 2024
	Core Deposit Intangible Assets		Customer Relationships		Total
Gross carrying amount	$	2,345	$	86,800	$	89,145
Accumulated amortization		1,600		23,898		25,498
Net carrying amount	$	745	$	62,902	$	63,647

Aggregate Amortization Expense Recognized

The following table has the aggregate amortization expense recognized in each period (in thousands):

	Three Months Ended March 31,
	2025		2024
Aggregate amortization expense	$	17,482	$	1,960

Estimated Amortization Expense of Intangible Assets

The following table discloses the estimated amortization expense of intangible assets in future periods (in thousands):

For the nine months ending December 31, 2025	$	75,786
For the year ending December 31, 2026		92,303
For the year ending December 31, 2027		81,711
For the year ending December 31, 2028		69,642
For the year ending December 31, 2029		60,700