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Loans (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
 
December 31, 2018
Balance:
 
 
 
 
Commercial
 
$
8,285,920

 
$
7,828,538

Commercial real estate
 
8,020,276

 
6,933,252

Home equity
 
513,066

 
552,343

Residential real estate
 
1,354,221

 
1,002,464

Premium finance receivables—commercial
 
3,442,027

 
2,841,659

Premium finance receivables—life insurance
 
5,074,602

 
4,541,794

Consumer and other
 
110,178

 
120,641

Total loans, net of unearned income
 
$
26,800,290

 
$
23,820,691

Mix:
 
 
 
 
Commercial
 
31
%
 
33
%
Commercial real estate
 
30

 
29

Home equity
 
2

 
2

Residential real estate
 
5

 
4

Premium finance receivables—commercial
 
13

 
12

Premium finance receivables—life insurance
 
19

 
19

Consumer and other
 
—

 
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, 2019
 
December 31, 2018
(Dollars in thousands)
 
Unpaid
Principal
Balance
 
Carrying
Value
 
Unpaid
Principal
Balance
 
Carrying
Value
PCI loans
 
$
455,784

 
$
425,372

 
$
341,555

 
$
318,394
Schedule of Loans Acquired with Deteriorated Credit Quality
The following table provides estimated details as of the date of acquisition on loans acquired in 2019 with evidence of credit quality deterioration since origination:
(Dollars in thousands)
ROC
 
STC
 
SBC
Contractually required payments including interest
$
29,963

 
$
54,422

 
$
140,541

Less: Nonaccretable difference
2,606

 
5,066

 
7,604

   Cash flows expected to be collected (1)  
$
27,357

 
$
49,356

 
$
132,937

Less: Accretable yield
2,319

 
5,974

 
8,477

    Fair value of PCI loans acquired
$
25,038

 
$
43,382

 
$
124,460

(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)
 
2019
 
2018
Accretable yield, beginning balance
 
$
34,876

 
$
36,565

Acquisitions
 
16,770

 
6,175

Accretable yield amortized to interest income
 
(18,226
)
 
(16,711
)
Reclassification from non-accretable difference (1)
 
5,516

 
4,835

Increases in interest cash flows due to payments and changes in interest rates
 
6,012

 
4,012

Accretable yield, ending balance
 
$
44,948

 
$
34,876

 
(1)
Reclassification is the result of subsequent increases in expected principal cash flows.