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Goodwill and Other Intangibles (Tables)
 3 Months Ended
Mar. 31, 2026
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, 2026 and December 31, 2025 by reportable segment are as follows (in thousands):

 

 

Commercial Banking

 

 

Institutional Banking

 

 

Personal Banking

 

 

Total

 

Balances as of January 1, 2026

 

$

1,042,577

 

 

$

76,492

 

 

$

720,756

 

 

$

1,839,825

 

Acquisition of HTLF

 

 

(1,339

)

 

 

—

 

 

 

(892

)

 

 

(2,231

)

Balances as of March 31, 2026

 

$

1,041,238

 

 

$

76,492

 

 

$

719,864

 

 

$

1,837,594

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balances as of January 1, 2025

 

$

63,113

 

 

$

76,492

 

 

$

67,780

 

 

$

207,385

 

Acquisition of HTLF

 

 

979,464

 

 

 

—

 

 

 

652,976

 

 

 

1,632,440

 

Balances as of December 31, 2025

 

$

1,042,577

 

 

$

76,492

 

 

$

720,756

 

 

$

1,839,825

 
Changes in Intangible Assets

The following table lists the finite-lived intangible assets that continue to be subject to amortization as of March 31, 2026 and December 31, 2025 (in thousands):

 

 

 

As of March 31, 2026

 

 

 

Core Deposit Intangible Assets

 

 

Customer Relationships

 

 

Total

 

Gross carrying amount

 

$

481,294

 

 

$

124,085

 

 

$

605,379

 

Accumulated amortization

 

 

101,011

 

 

 

40,959

 

 

 

141,970

 

Net carrying amount

 

$

380,283

 

 

$

83,126

 

 

$

463,409

 

 

 

As of December 31, 2025

 

 

 

Core Deposit Intangible Assets

 

 

Customer Relationships

 

 

Total

 

Gross carrying amount

 

$

481,294

 

 

$

124,085

 

 

$

605,379

 

Accumulated amortization

 

 

81,203

 

 

 

37,307

 

 

 

118,510

 

Net carrying amount

 

$

400,091

 

 

$

86,778

 

 

$

486,869

 
Aggregate Amortization Expense Recognized

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

 

 

Three Months Ended March 31,

 

 

 

2026

 

 

2025

 

Aggregate amortization expense

 

$

23,460

 

 

$

17,482

 
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, 2026

 

$

69,660

 

For the year ending December 31, 2027

 

 

82,528

 

For the year ending December 31, 2028

 

 

70,461

 

For the year ending December 31, 2029

 

 

61,515

 

For the year ending December 31, 2030

 

 

52,901