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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of core deposit intangibles and other intangibles For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows:
($ in Thousands)Three Months Ended March 31, 2020Year Ended December 31, 2019
Core deposit intangibles
Gross carrying amount at the beginning of the year$80,730  $58,100  
Additions during the period7,379  22,630  
Accumulated amortization(14,597) (12,456) 
Net book value$73,512  $68,274  
Amortization during the year$2,141  $7,130  
Other intangibles
Gross carrying amount at the beginning of the year $38,970  $44,887  
Additions during the period200  —  
Reductions due to sale(343) (217) 
Accumulated amortization(19,616) (24,643) 
Net book value $19,211  $20,027  
Amortization during the year$673  $2,818  
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance
A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance is as follows:
($ in Thousands)Three Months Ended March 31, 2020Year Ended December 31, 2019
Mortgage servicing rights
Mortgage servicing rights at beginning of period$67,607  $68,433  
Additions from acquisition1,357  —  
Additions2,359  11,606  
Amortization(3,635) (12,432) 
Mortgage servicing rights at end of period$67,688  $67,607  
Valuation allowance at beginning of period$(302) $(239) 
(Additions) recoveries, net(9,098) (63) 
Valuation allowance at end of period$(9,399) $(302) 
Mortgage servicing rights, net$58,289  $67,306  
Fair value of mortgage servicing rights$58,311  $72,532  
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)$8,548,600  $8,488,969  
Mortgage servicing rights, net to servicing portfolio0.68 %0.79 %
Mortgage servicing rights expense(a)
$12,733  $12,494  
(a) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net on the consolidated statements of income
Summary of estimated future amortization expense The following table shows the estimated future amortization expense for amortizing intangible assets:
($ in Thousands)Core Deposit IntangiblesOther IntangiblesMortgage Servicing Rights
Nine Months Ending December 31, 2020$6,608  $2,008  $9,609  
20218,811  2,653  13,307  
20228,811  2,629  10,456  
20238,811  2,610  8,279  
20248,811  2,591  6,632  
20258,811  2,302  5,372  
Beyond 202522,849  4,418  14,032  
Total Estimated Amortization Expense$73,512  $19,211  $67,688