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Loans (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
 
December 31, 2017
Balance:
 
 
 
 
Commercial
 
$
7,828,538

 
$
6,787,677

Commercial real estate
 
6,933,252

 
6,580,618

Home equity
 
552,343

 
663,045

Residential real estate
 
1,002,464

 
832,120

Premium finance receivables—commercial
 
2,841,659

 
2,634,565

Premium finance receivables—life insurance
 
4,541,794

 
4,035,059

Consumer and other
 
120,641

 
107,713

Total loans, net of unearned income
 
$
23,820,691

 
$
21,640,797

Mix:
 
 
 
 
Commercial
 
33
%
 
31
%
Commercial real estate
 
29

 
30

Home equity
 
2

 
3

Residential real estate
 
4

 
4

Premium finance receivables—commercial
 
12

 
12

Premium finance receivables—life insurance
 
19

 
19

Consumer and other
 
1

 
1

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, 2018
 
December 31, 2017
(Dollars in thousands)
 
Unpaid
Principal
Balance
 
Carrying
Value
 
Unpaid
Principal
Balance
 
Carrying
Value
PCI loans
 
$
341,555

 
$
318,394

 
$
375,237

 
$
350,690
Schedule of Loans Acquired with Deteriorated Credit Quality
The following table provides estimated details as of the date of acquisition on loans acquired in 2018 with evidence of credit quality deterioration since origination:
(Dollars in thousands)
 
Delaware Place Bank
 
American Enterprise Bank
Contractually required payments including interest
 
$
13,385

 
$
31,750

Less: Nonaccretable difference
 
1,197

 
3,813

   Cash flows expected to be collected (1)  
 
$
12,188

 
$
27,937

Less: Accretable yield
 
2,205

 
3,970

    Fair value of PCI loans acquired
 
$
9,983

 
$
23,967

(1) Represents undiscounted expected principal and interest cash at acquisition.
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)
 
2018
 
2017
Accretable yield, beginning balance
 
$
36,565

 
$
49,408

Acquisitions
 
6,175

 
426

Accretable yield amortized to interest income
 
(16,711
)
 
(21,512
)
Accretable yield amortized to indemnification asset/liability (1)
 
—

 
(1,087
)
Reclassification from non-accretable difference (2)
 
4,835

 
7,805

Increases (Decreases) in interest cash flows due to payments and changes in interest rates
 
4,012

 
1,525

Accretable yield, ending balance
 
$
34,876

 
$
36,565

 
(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.