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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The components of the provision for income taxes are as follows:
 
2018
 
2017
 
2016
 
(in thousands)
Current tax expense:

 

 

Federal
$
35,783

 
$
19,553

 
$
33,872

State
5,352

 
2,617

 
1,698


41,135

 
22,170

 
35,570

Deferred tax (benefit) expense:


 


 


Federal
(16,841
)
 
39,885

 
7,968

State
283

 
646

 
3,086


(16,558
)
 
40,531

 
11,054

Total income tax expense
$
24,577

 
$
62,701

 
$
46,624

Schedule of Effective Income Tax Rate Reconciliation
The differences between the effective income tax rate and the federal statutory income tax rate are as follows:
 
2018
 
2017
 
2016
Statutory tax rate
21.0
 %
 
35.0
 %
 
35.0
 %
Tax credit investments
(6.1
)
 
(7.8
)
 
(7.0
)
Tax-exempt income
(4.1
)
 
(6.6
)
 
(6.5
)
Bank owned life insurance
(0.4
)
 
(0.4
)
 
(0.6
)
Re-measurement of net deferred tax asset due to the Tax Act
(0.3
)
 
6.7

 

Change in valuation allowance
(0.1
)
 
1.2

 
0.3

Executive compensation
0.1

 
0.1

 
0.1

State income taxes, net of federal benefit
2.0

 
(0.5
)
 
1.2

Other, net
(1.6
)
 
(1.0
)
 
(0.1
)
Effective income tax rate
10.5
 %
 
26.7
 %
 
22.4
 %
Schedule of Deferred Tax Assets and Liabilities
The net deferred tax asset recorded by the Corporation is included in other assets and consists of the following tax effects of temporary differences as of December 31:
 
2018
 
2017
 
(in thousands)
Deferred tax assets:
 
 
 
Allowance for credit losses
$
37,906

 
$
40,554

Tax credit carryforward
27,615

 

Unrealized holding losses on securities
12,489

 
5,830

State loss carryforwards
11,605

 
11,855

Other accrued expenses
7,232

 
6,977

Deferred compensation
7,064

 
7,663

Postretirement and defined benefit plans
5,079

 
7,274

Other-than-temporary impairment of investments
1,803

 
2,045

Other
11,127

 
6,742

Total gross deferred tax assets
121,920

 
88,940

Deferred tax liabilities:
 
 
 
Direct leasing
31,466

 
21,917

Mortgage servicing rights
8,560

 
8,204

Acquisition premiums/discounts
5,294

 
6,030

Premises and equipment
3,579

 
3,099

Intangible assets
1,292

 
1,155

Other
12,178

 
10,420

Total gross deferred tax liabilities
62,369

 
50,825

Net deferred tax asset, before valuation allowance
59,551

 
38,115

Valuation allowance
(11,605
)
 
(11,855
)
Net deferred tax asset
$
47,946

 
$
26,260

Summary of Income Tax Contingencies
The following summarizes the changes in unrecognized tax benefits for the years ended December 31:
 
2018
 
2017
 
2016
 
(in thousands)
Balance at beginning of year
$
2,550

 
$
2,438

 
$
2,373

Current period tax positions
593

 
523

 
456

Lapse of statute of limitations
(417
)
 
(411
)
 
(391
)
Balance at end of year
$
2,726

 
$
2,550

 
$
2,438

Summary of Affordable Housing Tax Credit Investments And Other Credit Investments
The following table presents the balances of the Corporation's affordable housing tax credit investments, other tax credit investments and related unfunded commitments as of December 31:
 
 
 
2018
 
2017
 
2016
Included in other assets:
 
(in thousands)
Affordable housing tax credit investments, net
 
$
170,401

 
$
191,771

 
$
169,382

Other tax credit investments, net
 
72,584

 
79,753

 
89,881

 
Total tax credit investments, net
 
$
242,985

 
$
271,524

 
$
259,263

Included in other liabilities:
 
 
 
 
 
 
Unfunded affordable housing tax credit commitments
 
$
23,196

 
$
68,848

 
$
40,634

Other tax credit liabilities
 
59,823

 
62,049

 
69,132

 
Total unfunded tax credit commitments and liabilities
 
$
83,019

 
$
130,897

 
$
109,766





The following table presents other information relating to the Corporation's affordable housing tax credit investments and other tax credit investments for the years ended December 31:
 
 
 
2018
 
2017
 
2016
 
 
 
(in thousands)
Components of Income Taxes:
 
 
 
 
 
 
Affordable housing tax credits and other tax benefits
 
$
(30,721
)
 
$
(25,642
)
 
$
(23,571
)
Other tax credit investment credits and tax benefits
 
(6,385
)
 
(15,791
)
 
(8,761
)
Amortization of affordable housing investments, net of tax benefit
 
21,569

 
16,958

 
15,574

Deferred tax expense
 
1,341

 
6,201

 
2,177

 
Total reduction in income tax expense
 
$
(14,196
)
 
$
(18,274
)
 
$
(14,581
)
Amortization of Tax Credit Investments:
 
 
 
 
 
 
Affordable housing tax credits investment
 
$
3,355

 
$

 
$

Other tax credit investment amortization
 
8,094

 
11,028

 

 
Total amortization of tax credit investments recorded in non-interest expense
 
$
11,449

 
$
11,028

 
$