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Segment Information - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Other Noninterest Expense | $ 179,267 | $ 180,267 | $ 174,200
Net interest income (loss) | 227,632 | 225,044 | 221,025
Depreciation, Amortization and Accretion, Net | 7,347 | 7,243 | 7,315
Provision for (recovery of) loan losses | 4,990 | (7,333) | 3,415
Other income (loss) | 77,551 | 75,549 | 73,277
Gain (Loss) on Sale of Investments | 0 | (1,158) | 0
Other expense | 186,614 | 187,510 | 181,515
Income (loss) before taxes | 113,579 | 120,416 | 109,372
Income taxes (benefit) | 32,567 | 36,459 | 32,503
Net income | 81,012 | 83,957 | 76,869
Assets | 7,311,354 | 7,001,199 | 6,636,423
Loans | 5,068,085 | 4,829,682 | 4,620,505
Deposits | 5,347,642 | 5,128,000 | 4,789,994
Totals For Reportable Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other Noninterest Expense | 169,295 | 172,267 | 166,680
Net interest income (loss) | 227,393 | 227,056 | 218,197
Depreciation, Amortization and Accretion, Net | 7,347 | 7,243 | 7,315
Income taxes (benefit) | 37,238 | 41,246 | 35,329
Assets | 7,299,098 | 6,994,456 | 6,642,070
Deposits | 5,451,920 | 5,228,649 | 4,903,564
PNB |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 220,879 | 218,641 | 210,781
Provision for (recovery of) loan losses | 7,665 | 3,517 | 14,039
Other income (loss) | 75,188 | 69,384 | 70,841
Other expense | 167,476 | 163,641 | 158,651
Income (loss) before taxes | 120,926 | 120,867 | 108,932
Income taxes (benefit) | 36,581 | 37,960 | 33,696
Net income | 84,345 | 82,907 | 75,236
Assets | 7,229,764 | 6,910,386 | 6,522,174
Loans | 5,029,072 | 4,781,761 | 4,559,406
Deposits | 5,447,293 | 5,222,766 | 4,896,405
GFSC |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 6,588 | 7,457 | 8,741
Provision for (recovery of) loan losses | 1,415 | 1,544 | 1,175
Other income (loss) | 2 | (1) | 11
Other expense | 2,984 | 4,103 | 3,133
Income (loss) before taxes | 2,191 | 1,809 | 4,444
Income taxes (benefit) | 768 | 634 | 1,556
Net income | 1,423 | 1,175 | 2,888
Assets | 35,793 | 40,308 | 47,115
Loans | 35,469 | 40,645 | 47,228
Deposits | 4,627 | 5,883 | 7,159
SEPH |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | (74) | 958 | (1,325)
Provision for (recovery of) loan losses | (4,090) | (12,394) | (11,799)
Other income (loss) | 1,848 | 5,991 | 1,956
Other expense | 6,182 | 11,766 | 12,211
Income (loss) before taxes | (318) | 7,577 | 219
Income taxes (benefit) | (111) | 2,652 | 77
Net income | (207) | 4,925 | 142
Assets | 33,541 | 43,762 | 72,781
Loans | 15,153 | 23,956 | 38,014
Deposits | 0 | 0 | 0
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 239 | (2,012) | 2,828
Provision for (recovery of) loan losses | 0 | 0 | 0
Other income (loss) | 513 | 175 | 469
Other expense | 9,972 | 8,000 | 7,520
Income (loss) before taxes | (9,220) | (9,837) | (4,223)
Income taxes (benefit) | (4,671) | (4,787) | (2,826)
Net income | (4,549) | (5,050) | (1,397)
Assets | 12,256 | 6,743 | (5,647)
Loans | (11,609) | (16,680) | (24,143)
Deposits | (104,278) | (100,649) | (113,570)
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other Noninterest Expense | 0 | 0 | 0
Net interest income (loss) | 2,561 | 3,708 | 8,659
Depreciation, Amortization and Accretion, Net | 0 | 0 | 0
Income taxes (benefit) | 0 | 0 | 0
Assets | (13,557) | (18,556) | (30,369)
Deposits | (104,278) | (100,649) | (113,570)
Parent Co Gfsc Totals Not Eliminated [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other Noninterest Expense | 9,972 | 8,000 | 7,520
Net interest income (loss) | (2,322) | (5,720) | (5,831)
Depreciation, Amortization and Accretion, Net | 0 | 0 | 0
Income taxes (benefit) | (4,671) | (4,787) | (2,826)
Assets | 25,813 | 25,299 | 24,722
Deposits | $ 0 | $ 0 | $ 0

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