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Loans (Tables)
 12 Months Ended
Dec. 31, 2015
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,
2015
 
December 31,
2014
Balance:
 
 
 
 
Commercial
 
$
4,713,909

 
$
3,924,394

Commercial real estate
 
5,529,289

 
4,505,753

Home equity
 
784,675

 
716,293

Residential real estate
 
607,451

 
483,542

Premium finance receivables—commercial
 
2,374,921

 
2,350,833

Premium finance receivables—life insurance
 
2,961,496

 
2,277,571

Consumer and other
 
146,376

 
151,012

Total loans, net of unearned income, excluding covered loans
 
$
17,118,117

 
$
14,409,398

Covered loans
 
148,673

 
226,709

Total loans, net of unearned income
 
$
17,266,790

 
$
14,636,107

Mix:
 
 
 
 
Commercial
 
27
%
 
26
%
Commercial real estate
 
32

 
31

Home equity
 
5

 
5

Residential real estate
 
3

 
3

Premium finance receivables—commercial
 
14

 
16

Premium finance receivables—life insurance
 
17

 
16

Consumer and other
 
1

 
1

Total loans, net of unearned income, excluding covered loans
 
99
%
 
98
%
Covered loans
 
1

 
2

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:
 
 
December 31, 2015
 
December 31, 2014
(Dollars in thousands)
 
Unpaid
Principal
Balance
 
Carrying
Value
 
Unpaid
Principal
Balance
 
Carrying
Value
Bank acquisitions
 
$
326,470

 
$
271,260

 
$
285,809

 
$
227,229

Life insurance premium finance loans acquisition
 
372,738

 
368,292

 
399,665

 
393,479
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period
The following table provides estimated details as of the date of acquisition on loans acquired in 2015 with evidence of credit quality deterioration since origination:
(Dollars in thousands)
North Bank
 
CBWGE
 
Suburban
 
Delavan
Contractually required payments including interest
$
8,563

 
$
38,656

 
$
95,804

 
$
15,791

Less: Nonaccretable difference
1,027

 
4,437

 
13,888

 
1,442

   Cash flows expected to be collected (1)  
$
7,536

 
$
34,219

 
$
81,916

 
$
14,349

Less: Accretable yield
866

 
2,895

 
5,334

 
898

    Fair value of PCI loans acquired
$
6,670

 
$
31,324

 
$
76,582

 
$
13,451

(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)
 
2015
 
2014
Accretable yield, beginning balance
 
$
79,102

 
$
115,909

Acquisitions
 
9,993

 
—

Accretable yield amortized to interest income
 
(24,115
)
 
(36,956
)
Accretable yield amortized to indemnification asset (1)
 
(13,495
)
 
(30,691
)
Reclassification from non-accretable difference (2)
 
7,390

 
35,967

Increases (decreases) in interest cash flows due to payments and changes in interest rates
 
5,027

 
(5,127
)
Accretable yield, ending balance (3)
 
$
63,902

 
$
79,102

 
(1)
Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnification asset.
(2)
Reclassification is the result of subsequent increases in expected principal cash flows.
(3)
As of December 31, 2015, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $6.6 million. The remainder of the accretable yield related to bank acquisitions is expected to be amortized to interest income.