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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of the Company's Provision for Income Taxes
The components of the Company’s provision for income taxes for the years ended December 31, 2019, December 31, 2018, and December 31, 2017, were as follows:
(dollars in thousands)
2019

 
2018

 
2017

Current:
 
 
 
 
 
Federal
$
60,902

 
$
45,464

 
$
73,176

State
14,426

 
11,434

 
6,039

Total Current
75,328

 
56,898

 
79,215

Deferred:
 
 
 
 
 
Federal
(9,630
)
 
(2,172
)
 
5,042

State
(5,785
)
 
(4,102
)
 
(865
)
Total Deferred
(15,415
)
 
(6,274
)
 
4,177

Provision for Income Taxes
$
59,913

 
$
50,624

 
$
83,392
Schedule of significant components of the Company's Deferred Tax Liabilities and Assets
As of December 31, 2019, and December 31, 2018, significant components of the Company’s deferred tax liabilities and assets were as follows:
 
December 31,
(dollars in thousands)
2019

 
2018

Deferred Tax Liabilities:
 
 
 
Accelerated Depreciation
$
(4,064
)
 
$
(2,864
)
Accrued Pension Cost
(11,270
)
 
(11,270
)
Federal Home Loan Bank Stock
(3,416
)
 
(3,416
)
Lease Transactions
(48,487
)
 
(53,230
)
Operating Lease Liabilities
(26,731
)
 
—

Energy Tax Credits
(2,370
)
 
(5,274
)
Net Unrealized Gains on Investments Securities
(2,751
)
 
—

Investment in Variable Interest Entities
(3,783
)
 
(4,574
)
Deferred Loan Fees
(6,498
)
 
(6,688
)
Originated Mortgage Servicing Rights
(6,840
)
 
(6,548
)
Other
(1,597
)
 
(1,420
)
Gross Deferred Tax Liabilities
(117,807
)
 
(95,284
)
Deferred Tax Assets:
 
 
 
Allowance for Loan Losses
30,951

 
30,045

Minimum Pension Liability
13,980

 
12,989

Accrued Expenses
18,159

 
14,805

Postretirement Benefit Obligations
8,130

 
8,396

Capital Lease Expenses
2,171

 
2,172

Operating Lease Right-of-Use Assets
28,685

 
—

Restricted Stock
4,369

 
5,178

Net Unrealized Losses on Investments Securities
—

 
5,421

Deductible State and Local Taxes
3,558

 
3,242

Low Income Housing Investments
2,157

 
805

Other
6,236

 
4,244

Gross Deferred Tax Assets Before Valuation Allowance
118,396

 
87,297

Valuation Allowance
(2,460
)
 
(1,102
)
Gross Deferred Tax Assets After Valuation Allowance
115,936

 
86,195

Net Deferred Tax Liabilities
$
(1,871
)
 
$
(9,089
)
Schedule of reconciliation of the statutory federal income tax rate to the Company's Effective Tax Rate
The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2019, December 31, 2018, and December 31, 2017:
 
2019

 
2018

 
2017

Statutory Federal Income Tax Rate
21.00
 %
 
21.00
 %
 
35.00
 %
Increase (Decrease) in Income Tax Rate Resulting From:
 
 
 
 
 
State Taxes, Net of Federal Income Tax
2.53

 
2.29

 
1.50

Tax Reserve Adjustments1
(0.03
)
 
—

 
0.04

Low-Income Housing Investments
0.60

 
0.22

 
(1.18
)
Investment Tax Credits
(0.84
)
 
(1.04
)
 
(1.03
)
Bank-Owned Life Insurance
(0.51
)
 
(0.55
)
 
(0.85
)
Tax-Exempt Income
(0.53
)
 
(1.29
)
 
(2.57
)
Excess Tax Benefits - Stock Compensation
(0.22
)
 
(0.34
)
 
(0.83
)
Leveraged Lease
(1.54
)
 
(0.83
)
 
(0.03
)
Tax Reform Effects
—

 
(0.75
)
 
1.25

Other1
0.50

 
0.02

 
(0.19
)
Effective Tax Rate
20.96
 %
 
18.73
 %
 
31.11
 %
Schedule of reconciliation of the Company's Liability for Unrecognized Tax Benefits December 31, 2019, December 31, 2018, and December 31, 2017:
(dollars in thousands)
2019

 
2018

 
2017

Unrecognized Tax Benefits at Beginning of Year
$
5,541

 
$
5,292

 
$
6,574

Gross Increases, Related to Tax Positions Taken in a Prior Period
673

 
157

 
273

Gross Increases, Related to Current Period Tax Positions
715

 
885

 
1,124

Lapse of Statute of Limitations
(809
)
 
(793
)
 
(2,679
)
Unrecognized Tax Benefits at End of Year
$
6,120

 
$
5,541

 
$
5,292