Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Value of Intangible Assets Subject to Amortization

Identifiable intangible assets with finite lives are amortized over the periods benefited and are evaluated for impairment similar to other long-lived assets. The purchase and carrying values of intangible assets subject to amortization at December 31, 2023 and 2022 were as follows:

	December 31, 2023
	Purchase		Accumulated		Carrying
($ in thousands)	Value		Amortization		Value
Core deposit intangibles	$	235,845	$	209,658	$	26,187
Credit card and trust relationships		49,962		31,512		18,450
Total	$	285,807	$	241,170	$	44,637

	December 31, 2022
	Purchase		Accumulated		Carrying
($ in thousands)	Value		Amortization		Value
Core deposit intangibles	$	235,845	$	200,045	$	35,800
Credit card and trust relationships		49,962		29,569		20,393
Total	$	285,807	$	229,614	$	56,193

Aggregate Amortization Expense

Aggregate amortization expense by category of finite lived intangible assets for the years ended December 31, 2023, 2022, and 2021 are as follows:

	Years Ended December 31,
($ in thousands)	2023		2022		2021
Core deposit intangibles	$	9,613	$	11,909	$	14,304
Credit card and trust relationships		1,943		2,124		2,361
Total	$	11,556	$	14,033	$	16,665

Estimated Amortization Expense of Other Intangible Assets

The following table shows estimated amortization expense of other intangible assets at December 31, 2023 for the five succeeding years and all years thereafter, calculated based on current amortization schedules.

($ in thousands)
2024	$	9,413
2025		7,985
2026		5,322
2027		3,682
2028		3,306
Thereafter		14,929
Total	$	44,637