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Goodwill and Other Intangibles and Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill and intangible assets A summary of goodwill and other intangibles was as follows.
(in thousands)March 31, 2022December 31, 2021
Goodwill$317,189 $317,189 
Core deposit intangibles18,148 19,445 
Customer list intangibles2,731 2,858 
    Other intangibles20,879 22,303 
Goodwill and other intangibles, net$338,068 $339,492 
Schedule of goodwill A summary of goodwill was as follows. During 2021, goodwill increased due to the acquisitions of Mackinac and County. See Note 2 for additional information on the Company’s acquisitions.
Three Months EndedYear Ended
(in thousands)March 31, 2022December 31, 2021
Goodwill:
Goodwill at beginning of year$317,189 $163,151 
Acquisitions— 154,038 
Goodwill at end of period$317,189 $317,189 
Schedule of other intangible assets A summary of other intangible assets was as follows. During 2021, core deposit intangibles increased due to the acquisitions of Mackinac and County. See Note 2 for additional information on the Company’s acquisitions.
Three Months EndedYear Ended
(in thousands)March 31, 2022December 31, 2021
Core deposit intangibles:
Gross carrying amount$41,360 $41,360 
Accumulated amortization(23,212)(21,915)
Net book value$18,148 $19,445 
Additions during the period$— $13,595 
Amortization during the period$1,297 $2,987 
Customer list intangibles:
Gross carrying amount$5,523 $5,523 
Accumulated amortization(2,792)(2,665)
Net book value$2,731 $2,858 
Amortization during the period$127 $507 
Schedule of mortgage servicing rights A summary of the changes in the mortgage servicing rights asset was as follows.
Three Months EndedYear Ended
(in thousands)March 31, 2022December 31, 2021
Mortgage servicing rights asset:
MSR asset at beginning of year$13,636 $10,230 
Capitalized MSR886 4,329 
MSR asset acquired— 1,322 
Amortization during the period(696)(2,245)
MSR asset at end of period$13,826 $13,636 
Valuation allowance at beginning of year$(1,200)$(1,000)
Additions— (500)
Reversals600 300 
Valuation allowance at end of period$(600)$(1,200)
MSR asset, net$13,226 $12,436 
Fair value of MSR asset at end of period$16,621 $15,599 
Residential mortgage loans serviced for others$1,593,010 $1,583,577 
Net book value of MSR asset to loans serviced for others0.83 %0.79 %
Schedule of estimated future amortization expense for amortizing intangible assets and the MSR asset
The following table shows the estimated future amortization expense for amortizing intangible assets and the servicing assets. The projections are based on existing asset balances, the current interest rate environment and prepayment speeds as of March 31, 2022. The actual amortization expense the Company recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements and events or circumstances that indicate the carrying amount of an asset may not be recoverable.
(in thousands)Core deposit
intangibles		Customer list
intangibles		MSR assetLSR asset
Year ending December 31,
2022 (remaining nine months)
$3,520 $380 $1,777 $6,512 
20233,910 483 2,605 6,345 
20243,135 449 2,499 3,673 
20252,385 449 1,719 1,020 
20261,659 249 1,277 — 
20271,346 166 1,277 — 
Thereafter2,193 555 2,672 — 
Total$18,148 $2,731 $13,826 $17,550