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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Dividend paid | Dividend declared | Series C Cumulative Preferred Stock | Series C Cumulative Preferred Stock Dividend paid | Series C Cumulative Preferred Stock Dividend declared | Series D Cumulative Redeemable Preferred Stock | Series D Cumulative Redeemable Preferred Stock Dividend paid | Series D Cumulative Redeemable Preferred Stock Dividend declared | Series E Cumulative Redeemable Preferred Stock | Series E Cumulative Redeemable Preferred Stock Dividend paid | Series E Cumulative Redeemable Preferred Stock Dividend declared | Preferred Stock | Preferred Stock Series C Cumulative Preferred Stock | Preferred Stock Series D Cumulative Redeemable Preferred Stock | Preferred Stock Series E Cumulative Redeemable Preferred Stock | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Series C Cumulative Preferred Stock | Additional Paid-in Capital Series D Cumulative Redeemable Preferred Stock | Additional Paid-in Capital Series E Cumulative Redeemable Preferred Stock | Distributions in Excess of Accumulated Earnings | Distributions in Excess of Accumulated Earnings Dividend paid | Distributions in Excess of Accumulated Earnings Dividend declared | Distributions in Excess of Accumulated Earnings Series C Cumulative Preferred Stock | Distributions in Excess of Accumulated Earnings Series C Cumulative Preferred Stock Dividend paid | Distributions in Excess of Accumulated Earnings Series C Cumulative Preferred Stock Dividend declared | Distributions in Excess of Accumulated Earnings Series D Cumulative Redeemable Preferred Stock Dividend paid | Distributions in Excess of Accumulated Earnings Series D Cumulative Redeemable Preferred Stock Dividend declared | Distributions in Excess of Accumulated Earnings Series E Cumulative Redeemable Preferred Stock Dividend paid | Distributions in Excess of Accumulated Earnings Series E Cumulative Redeemable Preferred Stock Dividend declared | Accumulated Other Comprehensive (Loss) | Total Saul Centers, Inc. | Total Saul Centers, Inc. Dividend paid | Total Saul Centers, Inc. Dividend declared | Total Saul Centers, Inc. Series C Cumulative Preferred Stock | Total Saul Centers, Inc. Series C Cumulative Preferred Stock Dividend paid | Total Saul Centers, Inc. Series C Cumulative Preferred Stock Dividend declared | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock Dividend paid | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock Dividend declared | Total Saul Centers, Inc. Series E Cumulative Redeemable Preferred Stock | Total Saul Centers, Inc. Series E Cumulative Redeemable Preferred Stock Dividend paid | Total Saul Centers, Inc. Series E Cumulative Redeemable Preferred Stock Dividend declared | Noncontrolling Interests | Noncontrolling Interests Dividend paid | Noncontrolling Interests Dividend declared
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Beginning balance at Dec. 31, 2017 | $ 393,103 |  |  |  |  |  |  |  |  |  |  |  | $ 180,000 |  |  |  | $ 221 | $ 352,590 |  |  |  | $ (197,710) |  |  |  |  |  |  |  |  |  | $ (696) | $ 334,405 |  |  |  |  |  |  |  |  |  |  |  | $ 58,698 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of cumulative preferred stock |  |  |  |  |  |  | $ 72,367 |  |  |  |  |  |  |  | $ 75,000 |  |  |  |  | $ (2,633) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72,367 |  |  |  |  |  |  |  |
Stock redeemed or called during period, value |  |  |  | $ (75,017) |  |  |  |  |  |  |  |  |  | $ (75,000) |  |  | 0 |  | $ 2,311 |  |  |  |  |  | $ (2,328) |  |  |  |  |  |  |  |  |  |  | $ (75,017) |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to dividend reinvestment plan | 28,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 28,817 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued due to exercise of employee stock options and issuance of directors' deferred stock | 3,448 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 3,448 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,448 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units | 14,159 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,159 |  |
Net income | 63,059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,554 |  |  |  |  |  |  |  |  |  |  | 50,554 |  |  |  |  |  |  |  |  |  |  |  | 12,505 |  |
Change in unrealized loss on cash flow hedge | 594 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 441 | 441 |  |  |  |  |  |  |  |  |  |  |  | 153 |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  | $ (46,900) |  | $ (6,145) | $ (1,805) |  | $ (3,164) | $ (1,148) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (34,841) |  | $ (6,145) | $ (1,805) | $ (3,164) | $ (1,148) |  |  |  |  |  | $ (34,841) |  | $ (6,145) | $ (1,805) |  | $ (3,164) | $ (1,148) |  |  |  |  |  |
Common stock distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (12,059) |
Distributions payable common stock and distributions payable partnership units |  |  | (16,154) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,006) |  |  |  |  |  |  |  |  |  |  | (12,006) |  |  |  |  |  |  |  |  |  |  |  | $ (4,148)
Ending balance at Dec. 31, 2018 | 425,220 |  |  |  |  |  |  |  |  |  |  |  | 180,000 |  |  |  | 227 | 384,533 |  |  |  | (208,593) |  |  |  |  |  |  |  |  |  | (255) | 355,912 |  |  |  |  |  |  |  |  |  |  |  | 69,308 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of cumulative preferred stock |  |  |  |  |  |  |  |  |  | $ 106,265 |  |  |  |  |  | $ 110,000 |  |  |  |  | $ (3,735) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 106,265 |  |  |  |  |
Stock redeemed or called during period, value |  |  |  | $ (105,000) |  |  |  |  |  |  |  |  |  | $ (105,000) |  |  |  |  | $ 3,235 |  |  |  |  |  | $ (3,235) |  |  |  |  |  |  |  |  |  |  | $ (105,000) |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to dividend reinvestment plan | 22,498 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 22,494 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,498 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued due to exercise of employee stock options and issuance of directors' deferred stock | 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 4,399 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units | 3,180 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,180 |  |
Net income | 64,196 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,723 |  |  |  |  |  |  |  |  |  |  | 51,723 |  |  |  |  |  |  |  |  |  |  |  | 12,473 |  |
Change in unrealized loss on cash flow hedge | 343 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 255 | 255 |  |  |  |  |  |  |  |  |  |  |  | 88 |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  | (49,056) |  | $ (5,736) |  |  | (3,444) | (1,148) |  |  | $ (1,650) |  |  |  |  |  |  |  |  |  |  |  | (36,562) |  | $ (5,736) |  | (3,444) | (1,148) |  | $ (1,650) |  |  |  | (36,562) |  | $ (5,736) |  |  | (3,444) | (1,148) |  |  | $ (1,650) |  |  |
Common stock distributions |  |  |  |  |  |  |  |  |  |  | $ (257) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (257) |  |  |  |  |  |  |  |  |  |  |  |  | $ (257) |  |  | (12,494) |
Distributions payable common stock and distributions payable partnership units |  |  | (16,455) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,275) |  |  |  |  |  |  |  |  |  |  | (12,275) |  |  |  |  |  |  |  |  |  |  |  | (4,180)
Ending balance at Dec. 31, 2019 | 443,356 |  |  |  |  |  |  |  |  |  |  |  | 185,000 |  |  |  | 232 | 410,926 |  |  |  | (221,177) |  |  |  |  |  |  |  |  |  | 0 | 374,981 |  |  |  |  |  |  |  |  |  |  |  | 68,375 |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to dividend reinvestment plan | 7,735 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 7,732 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,735 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued due to exercise of employee stock options and issuance of directors' deferred stock | 1,967 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,967 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,967 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units | 1,677 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,677 |  |
Net income | 50,316 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,382 |  |  |  |  |  |  |  |  |  |  | 40,382 |  |  |  |  |  |  |  |  |  |  |  | 9,934 |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  | (1,650) |  |  |  |  | $ (3,446) | $ (1,148) |  | $ (4,950) |  |  |  |  |  |  |  |  |  |  |  |  | (1,650) |  |  |  | $ (3,446) | $ (1,148) | $ (4,950) |  |  |  |  | (1,650) |  |  |  |  | $ (3,446) | $ (1,148) |  |  |  |  |  |
Common stock distributions |  | $ (49,679) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (37,108) |  |  |  |  |  |  |  |  |  |  | $ (37,108) |  |  |  |  |  |  |  |  |  |  |  | $ (12,571) |
Distributions payable common stock and distributions payable partnership units |  |  | $ (16,645) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (12,438) |  |  |  |  |  |  |  |  |  |  | $ (12,438) |  |  |  |  |  |  |  |  |  |  |  | $ (4,207)
Ending balance at Dec. 31, 2020 | $ 427,533 |  |  |  |  |  |  |  |  |  |  |  | $ 185,000 |  |  |  | $ 235 | $ 420,625 |  |  |  | $ (241,535) |  |  |  |  |  |  |  |  |  | $ 0 | $ 364,325 |  |  |  |  |  |  |  |  |  |  |  | $ 63,208 |  |

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