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Loans (Tables)
 12 Months Ended
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Abstract]  
Summary of Loan Portfolio
The following table shows the Company's loan portfolio by category as of the dates shown:

(Dollars in thousands)
 
December 31, 2017
 
December 31, 2016
Balance:
 
 
 
 
Commercial
 
$
6,787,677

 
$
6,005,422

Commercial real estate
 
6,580,618

 
6,196,087

Home equity
 
663,045

 
725,793

Residential real estate
 
832,120

 
705,221

Premium finance receivables—commercial
 
2,634,565

 
2,478,581

Premium finance receivables—life insurance
 
4,035,059

 
3,470,027

Consumer and other
 
107,713

 
122,041

Total loans, net of unearned income, excluding covered loans
 
$
21,640,797

 
$
19,703,172

Covered loans
 
—

 
58,145

Total loans, net of unearned income
 
$
21,640,797

 
$
19,761,317

Mix:
 
 
 
 
Commercial
 
31
%
 
30
%
Commercial real estate
 
30

 
31

Home equity
 
3

 
4

Residential real estate
 
4

 
4

Premium finance receivables—commercial
 
12

 
12

Premium finance receivables—life insurance
 
19

 
18

Consumer and other
 
1

 
1

Total loans, net of unearned income, excluding covered loans
 
100
%
 
100
%
Covered loans
 
—

 
—

Total loans, net of unearned income
 
100
%
 
100
%
Unpaid Principal Balance and Carrying Value of Acquired Loans
The following table presents the unpaid principal balance and carrying value for these acquired loans as of the dates shown:

 
 
December 31, 2017
 
December 31, 2016
(Dollars in thousands)
 
Unpaid
Principal
Balance
 
Carrying
Value
 
Unpaid
Principal
Balance
 
Carrying
Value
PCI loans
 
$
375,237

 
$
350,690

 
$
509,446

 
$
471,786
Activity Related to Accretable Yield of Loans Acquired with Evidence of Credit Quality Deterioration Since Origination
The following table provides activity for the accretable yield of PCI loans.

 
 
Years Ended December 31,
(Dollars in thousands)
 
2017
 
2016
Accretable yield, beginning balance
 
$
49,408

 
$
63,902

Acquisitions
 
426

 
2,462

Accretable yield amortized to interest income
 
(21,512
)
 
(23,218
)
Accretable yield amortized to indemnification asset/liability (1)
 
(1,087
)
 
(5,746
)
Reclassification from non-accretable difference (2)
 
7,805

 
13,733

Increases (Decreases) in interest cash flows due to payments and changes in interest rates
 
1,525

 
(1,725
)
Accretable yield, ending balance
 
$
36,565

 
$
49,408

 
(1)
Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnification asset or increase the loss share indemnification liability.
(2)
Reclassification is the result of subsequent increases in expected principal cash flows.