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Segment Information - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 266,898 | $ 243,759 | $ 238,086
Provision for (recovery of) loan losses | 7,945 | 8,557 | (5,101)
Other income | 101,101 | 86,429 | 84,039
Gain (Loss) on Sale of Investments | (2,271) | 1,821 | 0
Other Noninterest Expense | 220,170 | 194,518 | 195,935
Depreciation, Amortization and Accretion, Net | 8,585 | 8,644 | 8,396
Other expense | 228,755 | 203,162 | 204,331
Income (loss) before income taxes | 131,299 | 118,469 | 122,895
Income tax expense (benefit) | 20,912 | 34,227 | 36,760
Net income | 110,387 | 84,242 | 86,135
Assets | 7,804,308 | 7,537,620 | 7,467,586
Loans | 5,692,132 | 5,372,483 | 5,271,857
Total deposits | 6,260,860 | 5,817,326 | 5,521,956
Totals For Reportable Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 266,206 | 243,171 | 238,224
Other Noninterest Expense | 205,552 | 185,713 | 186,204
Depreciation, Amortization and Accretion, Net | 8,585 | 8,644 | 8,396
Income tax expense (benefit) | 24,922 | 36,922 | 41,117
Assets | 7,793,664 | 7,524,830 | 7,447,148
Total deposits | 6,338,938 | 5,900,125 | 5,634,008
PNB |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 258,547 | 235,243 | 227,576
Provision for (recovery of) loan losses | 7,569 | 9,898 | 2,611
Other income | 88,981 | 82,742 | 79,959
Other expense | 206,843 | 185,891 | 182,718
Income (loss) before income taxes | 133,116 | 122,196 | 122,206
Income tax expense (benefit) | 23,644 | 34,881 | 37,755
Net income | 109,472 | 87,315 | 84,451
Assets | 7,753,848 | 7,467,851 | 7,389,538
Loans | 5,671,173 | 5,339,255 | 5,234,828
Total deposits | 6,334,796 | 5,896,676 | 5,630,199
GFSC |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 5,048 | 5,839 | 5,874
Provision for (recovery of) loan losses | 1,328 | 1,917 | 1,887
Other income | 187 | 103 | 57
Other expense | 3,245 | 3,099 | 4,515
Income (loss) before income taxes | 662 | 926 | (471)
Income tax expense (benefit) | 141 | 666 | (164)
Net income | 521 | 260 | (307)
Assets | 31,388 | 32,077 | 32,268
Loans | 32,664 | 33,385 | 32,661
Total deposits | 4,142 | 3,449 | 3,809
SEPH |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 2,611 | 2,089 | 4,774
Provision for (recovery of) loan losses | (952) | (3,258) | (9,599)
Other income | 5,900 | 519 | 3,068
Other expense | 4,049 | 5,367 | 7,367
Income (loss) before income taxes | 5,414 | 499 | 10,074
Income tax expense (benefit) | 1,137 | 1,375 | 3,526
Net income | 4,277 | (876) | 6,548
Assets | 8,428 | 24,902 | 25,342
Loans | 1,636 | 10,891 | 12,354
Total deposits | 0 | 0 | 0
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 692 | 588 | (138)
Provision for (recovery of) loan losses | 0 | 0 | 0
Other income | 6,033 | 3,065 | 955
Other expense | 14,618 | 8,805 | 9,731
Income (loss) before income taxes | (7,893) | (5,152) | (8,914)
Income tax expense (benefit) | (4,010) | (2,695) | (4,357)
Net income | (3,883) | (2,457) | (4,557)
Assets | 10,644 | 12,790 | 20,438
Loans | (13,341) | (11,048) | (7,986)
Total deposits | (78,078) | (82,799) | (112,052)
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 1,275 | 1,500 | 2,164
Other Noninterest Expense | 0 | 0 | 0
Depreciation, Amortization and Accretion, Net | 0 | 0 | 0
Income tax expense (benefit) | 0 | 0 | 0
Assets | (16,521) | (14,679) | (9,204)
Total deposits | (78,078) | (82,799) | (112,052)
Parent Co Gfsc Totals Not Eliminated [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | (583) | (912) | (2,302)
Other Noninterest Expense | 14,618 | 8,805 | 9,731
Depreciation, Amortization and Accretion, Net | 0 | 0 | 0
Income tax expense (benefit) | (4,010) | (2,695) | (4,357)
Assets | 27,165 | 27,469 | 29,642
Total deposits | $ 0 | $ 0 | $ 0

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