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Purchased Credit Impaired ("PCI") Loans (Tables)
 3 Months Ended
Mar. 31, 2018
Covered Loans [Line Items]  
Rollforward of PCI Loans, Net of Allowance for Loan Losses
The following table is a roll forward of PCI loans, net of the allowance for loan losses, for the three months ended March 31, 2018 and 2017.

(in thousands)
Contractual Cashflows
 
Non-accretable Difference
 
Accretable Yield
 
Carrying Amount
Balance December 31, 2017
$
112,710

 
$
29,005

 
$
13,962

 
$
69,743

Principal reductions and interest payments
(12,142
)
 
—

 
—

 
(12,142
)
Accretion of loan discount
—

 
—

 
(1,755
)
 
1,755

Changes in contractual and expected cash flows due to remeasurement
2,863

 
—

 
—

 
2,863

Balance March 31, 2018
$
103,431

 
$
29,005


$
12,207


$
62,219

 
 
 
 
 
 
 
 
Balance December 31, 2016
$
66,003

 
$
18,902

 
$
13,176

 
$
33,925

Acquisitions
70,435

 
11,669

 
8,550

 
50,216

Principal reductions and interest payments
(4,310
)
 
—

 
—

 
(4,310
)
Accretion of loan discount
—

 
—

 
(1,389
)
 
1,389

Changes in contractual and expected cash flows due to remeasurement
3,166

 
(307
)
 
1,165

 
2,308

Reductions due to disposals
(1,341
)
 
(345
)
 
(264
)
 
(732
)
Balance March 31, 2017
$
133,953

 
$
29,919


$
21,238


$
82,796
Covered Loans  
Covered Loans [Line Items]  
Summary of PCI Loans by Category
Below is a summary of PCI loans by category at March 31, 2018 and December 31, 2017:
 
 
March 31, 2018
 
December 31, 2017
(in thousands)
Weighted-
Average
Risk Rating1
Recorded
Investment
PCI Loans
 
Weighted-
Average
Risk Rating1
Recorded
Investment
PCI Loans
Commercial and industrial
6.35
$
2,966

 
6.38
$
3,212

Real estate:
 
 
 
 
 
Commercial - investor owned
7.26
37,137

 
7.36
42,887

Commercial - owner occupied
6.39
10,886

 
6.48
11,332

Construction and land development
6.04
5,553

 
5.99
5,883

Residential
6.02
10,008

 
5.99
10,781

Consumer and other
2.76
56

 
2.84
59

Total
 
$
66,606

 
 
$
74,154

1Risk ratings are based on the borrower's contractual obligation, which is not reflective of the purchase discount.
Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category
The aging of the recorded investment in past due PCI loans by portfolio class and category at March 31, 2018 and December 31, 2017 is shown below:

 
March 31, 2018
(in thousands)
30-89 Days
 Past Due
 
90 or More
Days
Past Due
 
Total
Past Due
 
Current
 
Total
Commercial and industrial
$
—

 
$
—

 
$
—

 
$
2,966

 
$
2,966

Real estate:
 
 
 
 
 
 
 
 
 
Commercial - investor owned
944

 
—

 
944

 
36,193

 
37,137

Commercial - owner occupied
—

 
665

 
665

 
10,221

 
10,886

Construction and land development
88

 
—

 
88

 
5,465

 
5,553

Residential
84

 
294

 
378

 
9,630

 
10,008

Consumer and other
—

 
—

 
—

 
56

 
56

Total
$
1,116

 
$
959


$
2,075


$
64,531


$
66,606


 
December 31, 2017
(in thousands)
30-89 Days
 Past Due
 
90 or More
Days
Past Due
 
Total
Past Due
 
Current
 
Total
Commercial and industrial
$
—

 
$
—

 
$
—

 
$
3,212

 
$
3,212

Real estate:
 
 
 
 
 
 
 
 
 
Commercial - investor owned
—

 
3,034

 
3,034

 
39,853

 
42,887

Commercial - owner occupied
—

 
673

 
673

 
10,659

 
11,332

Construction and land development
—

 
—

 
—

 
5,883

 
5,883

Residential
328

 
255

 
583

 
10,198

 
10,781

Consumer and other
—

 
—

 
—

 
59

 
59

Total
$
328

 
$
3,962


$
4,290


$
69,864


$
74,154
Summary of FDIC Loss Share Receivable
Outstanding customer balances on PCI loans were $85.9 million and $94.9 million as of March 31, 2018, and December 31, 2017, respectively.