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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 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)Six Months Ended June 30, 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(16,800) (12,456) 
Net book value$71,309  $68,274  
Amortization during the year$4,344  $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(17,435) (217) 
Accumulated amortization(20,285) (24,643) 
Net book value $1,450  $20,027  
Amortization during the year$1,343  $2,818  
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance
A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance is as follows:
($ in Thousands)Six Months Ended June 30, 2020Year Ended December 31, 2019
Mortgage servicing rights
Mortgage servicing rights at beginning of period$67,607  $68,433  
Additions from acquisition1,357  —  
Additions7,812  11,606  
Amortization(10,043) (12,432) 
Mortgage servicing rights at end of period$66,734  $67,607  
Valuation allowance at beginning of period$(302) $(239) 
(Additions) recoveries, net(17,029) (63) 
Valuation allowance at end of period$(17,331) $(302) 
Mortgage servicing rights, net$49,403  $67,306  
Fair value of mortgage servicing rights$49,423  $72,532  
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)$8,454,204  $8,488,969  
Mortgage servicing rights, net to servicing portfolio0.58 %0.79 %
Mortgage servicing rights expense(a)
$27,072  $12,494  
(a) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net on the consolidated statements of income
Summary of estimated future amortization expense The following table shows the estimated future amortization expense for amortizing intangible assets:
($ in Thousands)Core Deposit IntangiblesOther IntangiblesMortgage Servicing Rights
Six Months Ending December 31, 2020$4,405  $100  $7,676  
20218,811  200  14,970  
20228,811  200  10,982  
20238,811  200  8,269  
20248,811  200  6,409  
20258,811  200  5,082  
Beyond 202522,849  350  13,346  
Total Estimated Amortization Expense$71,309  $1,450  $66,734