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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income, Gross $ 90,225 $ 72,525 $ 163,919 $ 92,456
Unrealized holding gains (losses) during the period, Gross 83,546 (23,993) 186,472 (109,308)
Amounts reclassified into net income: HTM securities, Gross (21) (8) (30) (20)
Amounts reclassified into net income: Realized (gains) losses on disposals and OTTI of AFS securities, Gross (1,300) 2,870 (2,377) 7,419
Total unrealized gains (losses) on investment securities, Gross 82,225 (21,131) 184,065 (101,909)
Amount reclassified into net income: Net actuarial loss, Gross 664 531 1,328 1,063
Total defined pension and other post-retirement benefit plans, Gross 664 531 1,328 1,063
Other comprehensive income (loss), Gross 82,889 (20,600) 185,393 (100,846)
Comprehensive income (loss) before tax 173,114 51,925 349,312 (8,390)
Net income, Tax 17,959 13,706 30,305 14,712
Unrealized holding gains (losses) during the period, Tax 17,544 (5,038) 39,157 (22,955)
Amounts reclassified into net income: HTM securities, Tax (4) (2) (6) (4)
Amounts reclassified into net income: Realized (gains) losses on disposals and OTTI of AFS securities, Tax (273) 603 (499) 1,558
Total unrealized gains (losses) on investment securities, Tax 17,267 (4,437) 38,652 (21,401)
Amount reclassified into net income: Net actuarial loss, Tax 140 111 279 223
Total defined pension and other post-retirement benefit plans, Tax 140 111 279 223
Other comprehensive income (loss), Tax 17,407 (4,326) 38,931 (21,178)
Comprehensive income (loss), Tax 35,366 9,380 69,236 (6,466)
Net income 72,266 58,819 133,614 77,744
Unrealized holding gains (losses) arising during period 66,002 (18,955) 147,315 (86,353)
Amounts reclassified into net income: HTM Securities (17) (6) (24) (16)
Amounts reclassified into net income: Realized (gains) losses on disposals and OTTI of available-for-sale securities (1,027) 2,267 (1,878) 5,861
Total unrealized gains (losses) on investment securities 64,958 (16,694) 145,413 (80,508)
Amount reclassified into net income: Net actuarial loss 524 420 1,049 840
Total defined benefit pension and post-retirement plans 524 420 1,049 840
Other comprehensive income (loss) 65,482 (16,274) 146,462 (79,668)
Comprehensive income (loss) $ 137,748 $ 42,545 $ 280,076 $ (1,924)